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    Breeders of the Nephelym [v0.766.1 Test] – Download | DerelictHelmsman

    Breeders of the Nephelym Free Download Adult Games DerelictHelmsman

    Breeders Of The Nephelym v0.766.1 Test by DerelictHelmsman, Breeders of the Nephelym Game is an immersive, beautifully erotic 3D adventure game centered around catching and breeding the Nephelym, an enigmatic race of monster-human hybrids.​


    Updated: 2026-08-12
    Release Date: 2026-08-12
    Developer: DerelictHelmsman Patreon – Discord – Twitter – Wiki
    Censored: No
    Version: v 0.766.1 Test
    OSWindows x64 DX11 only
    Language: English
    Genre: 3DCG, 3D game, Adventure, Furry, Breeding, Animated, Fantasy, Female protagonist, Furry, Male protagonist, Monster, Monster girl, Pregnancy, Vaginal sex, Futa/trans, Management, Titfuck, Oral sex, Sandbox

    Installation
    1- Extract to desired location.
    2- Click on “BOTN.exe” to start playing.
    Cheat Codes: (And Creator Mode Code)
    CREATOR MODE (only works in menu, not ingame): 5vg6dbEwqEk9

    Use the settings menu and enter codes exactly as is, spaces and case matter. They are best entered after starting the game.

    • add money
    • add Favor
    • infinite lust
    • enable spirit form
    • infinite spirit
    • max trait level
    • all barns
    • max all fluids
    • win surprise sex
    • all portals
    • go home
    • remove cheats
    Changelog
    v0.766.1 Test

    Event-Driven Asynchronous Asset Loading
    Rather than have every block of data as its own asset (with an unnecessary inheritance hierarchy), everything was merged into data tables. What was once almost 1000 bloated asset files is now reduced to 10. This also allowed me to remove my own registry implementation, and all of the excess looping attached to it.

    While that drastically improved game data, the real work was dealing with the hard asset references such as meshes, textures, and animations. Every one was converted to a soft asset reference, and is now loaded on the fly asynchronously. More importantly, the assets are unloaded when no longer needed.
    These aspects corrected massive flaws that have crept into the game over the last 10 years. The result is a far shorter game boot time, roughly a 75% reduction in RAM usage, and lower VRAM usage.
    If you ever struggled to even launch the game, try it now.

    Rewritten Blessed Ones
    The code for blessed ones became a mess, consisting of an ugly blend of C++ and blueprint (the engine’s slow nasty scripting language). Additionally, they were placed in the map itself which caused issues and forced all of them to be loaded when the map loaded.
    Now all blessed ones are purely written in C++ and spawned dynamically. They teleport around using a new node system based on game state.
    Blessed ones are now asynchronously loaded/unloaded as needed, which opens the door for having potentially thousands of them scattered across the world.

    Comprehensive Codebase Cleanup
    10 years of cruft has been sorted. I removed header files from other header files where possible, reworked redundant logic, removed ugly or dead code. Additionally, I now use Rider for debugging/code browsing rather than the M$BS bloatware Visual Studio. The MSVC compiler is still used behind the scenes.
    Also the game and engine are now grouped together in a monorepo setup.

    Systems are No Longer Actors
    Previously I had every game system, such as the character and breeding systems, as actors that were spawned in the world and then maintained with loops. This was terribly inefficient, as actors contain so much code that was not being used. It turns out the engine supplies USubsystem classes designed for exactly this purpose.
    Every system was converted to a USubsystem, and delegates now replace my own event loops. The result is less random hitching, RAM usage, and faster code performance.

    Save File Overhaul and the .sexy File Format
    This one will certainly be a welcomed change. Since the beginning, save wipes have been necessary because I did not control the data. Well now I do.
    Rather than blindly relying on the engine’s save system, I now define and serialize every bit of data myself. Not only does this reduce the save file size drastically, it means save wipes are going to be very rare going forward.
    This also means a new custom file format for everything the game can output. Saves, character presets, and Lovense toy presets are all now saved in highly efficient .sexy files.
    Saves are no longer limited to slots, the entire concept of slots is removed in favor of as many .sexy save files as you want. You can now delete saves in the game itself.
    The game will automatically convert old character presets from .sav to the new .sexy format, but eventually I will remove this legacy code, so make sure they get converted.

    Game Logic Node Redesign and Doubling Down on Pure C++
    The game has many nodes around the map to control where characters appear, where sex scenes happen, etc. A good portion of those nodes had messy logic defined in blueprint, but not anymore.
    Every node was moved to pure C++, and the logic was cleaned up. Many redundant nodes were removed in favor of the new unified character teleport system mentioned above.
    Even though the vast majority of game has always been written in C++, I let some sloppy blueprint stay around far longer than I should have. Well that will not be happening anymore. The only blueprint left to remove is the animation blueprints, but that will take some intense study to get right for a future build.
    Additionally, the game and engine are now compiled with C++17, and the latest version of MSVC that the engine supports (14.29).

    Dialogue Now Powered by Ink
    My clunky dialogue system served the game well for years, but it was completely removed in favor of a system based on Ink (https://www.inklestudios.com/ink/).
    Ink is a full scripting language for dialogue that allows supreme narrative control that my old system could never achieve.

    I wrote an efficient system around the inkcpp library that focuses on high performance. Porting the old dialogue over to Ink took a long time, but I did make some improvements to dialogue while I was at it.

    Optimized Unified Water System
    In build 0.761 I added a dynamic water system, but it was only used for lakes and rivers. Additionally, it was very slow and resource intensive. Hopefully now that is no longer the case.

    The number of render targets used by the water was reduced, and how they get rendered to was overhauled to be much faster. Vertex displacement was removed in favor of a normal driven effect, which enabled me to remove the ultra high triangle meshes required for water with only a minimal visual difference.
    The old water system was completely removed, and the dynamic system now powers the ocean and lava.

    Data Optimization
    I removed as much UPROPERTY macro bloat from the data as possible, and optimized the data itself. Groups of bools were converted to flags, and any unused bloat was removed. This is an ongoing process that will continue.

    Modifying the Engine
    Since I will never “upgrade” to UE5, I have taken full control of the engine itself. It is based on the final version of UE4, and over time I will be customizing and improving it as needed.

    End of OBF
    The game exe and local data folders are BOTN once again, perhaps one day I will tell you what OBF was.

    v0.762.1

    • Added: It’s now possible for the breeder to acquire traits
    • Added: New food items that grant traits to the breeder or wild nephelym
    • Added: Recipe scavenger hunt
    • Added: Bryn, the giant ogre chef and food merchant
    • Added: Envy, the fourth sexy sin and consumer of traits
    • Changed: Trait buttons in the character creator are now functional for breeders
    • Changed: Lowered prices of clothing items
    • Changed: Updated the game and engine to use Windows SDK 10.0.19041
    • Changed: Going forward the game will use a simple integer versioning scheme
    • Removed: Breeder presets aside from the default, as those are entirely up to you
    • Removed: Music, temporarily, until I can find something better

    v0.761.11 Steam

    * Added Breeder’s Log — a record of relevant messages, accessed in the menu
    * Added more graphics options
    * Optimized the Lovense system, Mobile (Automatic) was removed
    * Fixed many bugs and issues, including multiple body traits on wild Nephelym

    v0.761.6
    * New WIP water system with dynamic splashing and caustics (ocean unaffected, it will require its own system)
    * Celeste can now be the daily toy
    * Added sex scenes with Celeste
    * Added sex scenes with Yasmine (finally)
    * Fixed issues with blessed scenes in the gallery
    * Moved to a more efficient way of specifying fluid FX for sex scenes. This is mostly under the hood, but it makes it easier for me to manage. It is a tedious WIP, so expect issues. Every scene will be complete before the next public build.
    * Fixed issues with fur jitter
    * Fixed daily toy issues
    * Added new setting to allow vagrants to initiate sex with the breeder

    v0.761.58
    N/A

    v0.761.53

    • First pass on the clothing system
    • Added new blessed clothing merchant: Celeste
    • Clothing color is again exposed in the creator
    • Added support for randomized dialogue
    • Improved dialogue system, escape now works properly
    • Switched all GameplayTags to native; performance increase
    • Fixed various bugs and issues

    v0.760
    UI

    • Completely rewritten/redesigned to be more game friendly.
    • There is now a dedicated inventory and quest menu.
    • A command prompt can be summoned at anytime with the ~ key.
    • More sophisticated filtering will only show content that’s relevant.
    • The UI can be completely toggled on/off at anytime with the H key.

    Game

    • Fluids are now items, and no longer measured in ml.
    • Breeding tasks are now logged in a menu, and can be completed there.
    • Keystones and quest items are now proper items stored in the inventory.
    • Condensed stats down to lore friendly Lust, Fertility, and Aptitude.
    • The concept of time/date no longer exists, there is just day and night cycling for eternity.

    Character Editor

    • All creation now takes place in a dedicated environment.
    • Changes are preserved when changing from female to futa or futa to female.
    • Clothing color changes are no longer possible (this is to prepare for a proper clothing system coming soon).

    Work in Progress

    • Gallery, a new one is being built that will support every sex scene, not just breeding scenes.
    • Body fluid material customization, stored per character preset.
    • Clothing system, with a vendor and proper outfit equip system.
    • A breeder menu, related to the above clothing system.
    • A ranch management menu.
    • Controller support.

    v0.756.1
    Moving to Unreal Engine 5 turned out to not be worth the sacrifice and development efforts. I may change my mind on this in the future, but for now I have decided to focus on adding content and optimizing the game in UE 4.27.

    This build was dedicated to adding Lovense sex toy support, this is a first test before the next build which will be public.

    Added: Lovense sex toy support
    Added: Empathy system for sex toys
    Added: Pawsmaati overhaul, sex positions now earned per zone
    Added: Music (see credits below)
    Added: New Bovaur variant: Mare
    Added: New hybrid: Unicorn
    Added: Dick sucking animations for tentacles
    Fixed: Breasts don’t animate during milk harvesting
    Fixed: Particles not working during some harvesting scenes
    Fixed: Various other issues
    Updated: Translations
    Updated: Ancient Stone of Glory
    Hotfix: Crash when breeding mares
    Hotfix: Bunny spawns overridden by bovaur
    Hotfix: Volume settings not stored properly.

    v0.755.3a
    Exposed more sex scenes to roamers and vagrants
    * Fixed: Surabhi does not yield semen during harvesting

    v0.754.3

    • Pregnancy now takes 3 days
    • Fixed tooltips
    • Updated translations
    • Updated Ancient Stone of Glory

    v0.754A

    Here is a brief overview of the new system:

    • Stats are now ranked E-S.
    • Stat ranks cannot be leveled with breeding. Player needs to catch better wild Nephelym with better ranks.
    • Stats can rise by both leveling and breeding.
    • Rarity has been introduced, which affects stats, ranks, and traits.
    • Presets can now be restricted to rarities, so you can have legendary schemes.
    • Loyalty has been replaced with Excitement.
    • Excitement will decrease if no actions are performed per day. With enough excitement, stat gain from breeding and max lust is increased.
    • Most traits have been completely changed. See the tooltips for information.
    • Some traits are ranked: Bronze, Silver, Gold.
    • Removed traits that did not fit the lore and theme of the game: Abomination, Grungy, Gaudy, Sadistic (now Efficient).
    • Females now have access to exclusive Motherly trait for balance.
    • Releasing Nephelym now has purpose: it will increase the World Level for that race.
    • World Level governs the rarity of roamers.
    • Surprise Sex is now Wild Sex, gone is the need to repeatedly click. Rather, there is an automatic stat comparison that takes place.
    • Nephelym you house at the ranch will develop preferences for positions, variants, body types, and specific other mates.
    • Preferences are ranked: Enjoy, Like, Love, Worship.

    v0.753.7a
    Fluids are now displayed at each barn
    Q hotkey can be used for quick actions at barns and breeding yards
    Nephelym lists are now sorted alphabetically
    Details are displayed by default when interacting with roamers
    Project renamed from Radiant to OBF (this will make sense later)
    Copy and paste added for faces in creator mode
    Fixed Mega Slime’s dialogue

    v0.753.6A
    Added surprise in Hedon Township
    Futa breeders can now engage in sex with blessed ones as a female
    Fixed various issues

    v0.753.2A
    Progress on adding new erotic content is going well. For the next build, FxF surprise sex and tentacle scenes for futas and males will be added.

    Added remaining spontaneous blow job scenes
    Added ability to engage in loving blow jobs at barns
    You can now choose how to engage in surprise sex
    Fixed issues with tentacles
    Fixed various issues

    v0.753 Alpha
    New motion animations for males
    Physics should be more stable during transitions
    Fixed issues introduced in recent builds
    Updated translations
    Updated the Ancient Stone of Glory

    v0.752.5 Alpha

    • Revamped cowgirl sex positions
    • Added all size pairs for cowgirl and reverse cowgirl
    • Fixed various issues

    v0.752.4
    Progress is good on revamping the sex scenes. I may or may not take a break and work on the tentacle sex system in one of the near future builds.
    Revamped missionary sex position
    Added all size pairs for missionary
    Added hybrid for minotaur + dragon (surabhi)
    Added hybrid for minotaur + titan (kujata)
    Improved body point accuracy (used for hand IK during sex scenes)
    Fixed various issues

    v0.752.3 Alpha
    Revamped butterfly position
    Added all size pairs for butterfly
    Easter surprise
    Fixed various small issues
    Removed incest at the request of Patreon

    v0.751.1 Alpha
    You can now edit the breeder’s appearance after starting a game
    Spontaneous BJ can now be selected (SS is used for missing scenes)
    Added new minotaur variant for bovaur race
    Added setting for offspring generation
    Fixed issues with blow jobs
    Fixed spirit form editing not showing current form
    Fixed Leylanna’s spirit form dialogue and crash

    v0.749 Alpha
    This build was dedicated to upgrading presets to allow for the modification of trait shapes. Body Composition has been removed in favor of giving preset creators full control over the shape.
    Added the ability to edit trait shapes per preset
    Restored and upgraded default presets
    Fixed various issues from the last build, a few more remain still

    0.748.1 Alpha
    Implemented a proper loading screen
    Switched to asynchronous asset loading on startup (should fix black screen)
    Fixed fur flickering and rendering issues
    Fixed roamers moving during surprise sex
    Cum inflation and fluid FX now work on roamers
    Cum inflation works on the breeder during blessed scenes
    Improved head tracking
    Improved blow job mouth penetration
    Upgrade to latest engine version
    Unified physics using the engine’s new system, all characters now have physics
    Unified all sex scene code, no more separate paths for breeding, blessed, etc.
    Fixed other various crashes and small bugs

    v0.747 Alpha
    Thank you for your patience while I implemented the first pass on game progression. A lot of work went into this, and players coming from the last public build will find many new blessed ones with unique sex scenes.

    This is not the end of the game progression, but starting with 0.748 I will return to the breeding and surprise sex systems.

    v0.743 Aplha

    • Added Amorous Hallows gate progression

    v0.742 Alpha

    • Added Climax Peak gate progression
    • Fixed task generation for female breeders with futa disabled

    v0.738 Alpha

    • Added game progression 1
    • The Avatars of the Goddess must be activated, the NPCs will guide you
    • Fixed issues
    • Updated translations

    Special thanks to translators:

    • CellarCat (Korean)
    • MAYDAYMAY1 (Chinese)
    • taVee (Thai)
    • frost 90909090 (Portuguese)
    • Bruffit (Russian)
    • J0a0n (Czech)
    • Powerack (Czech)
    • RubyRZND (Spanish)

    v0.738 Alpha

    • Added game progression 1
    • The Avatars of the Goddess must be activated, the NPCs will guide you
    • Fixed issues
    • Updated translations

    Special thanks to translators:

    • CellarCat (Korean)
    • MAYDAYMAY1 (Chinese)
    • taVee (Thai)
    • frost 90909090 (Portuguese)
    • Bruffit (Russian)
    • J0a0n (Czech)
    • Powerack (Czech)
    • RubyRZND (Spanish)

    0.738 Alpha

    • Added game progression 1
    • The Avatars of the Goddess must be activated, the NPCs will guide you
    • Fixed issues
    • Updated translations

    Special thanks to translators:

    • CellarCat (Korean)
    • MAYDAYMAY1 (Chinese)
    • taVee (Thai)
    • frost 90909090 (Portuguese)
    • Bruffit (Russian)
    • J0a0n (Czech)
    • Powerack (Czech)
    • RubyRZND (Spanish)

    v0.737 Alpha
    N/A

    v0.736 Alpha
    Added endless daze mechanic with a blessed ghost (see below)
    Added Lap Dance sex position
    Added hybrids Akabeko and Lamassu
    Added some new dialogue
    Fixed glowing hair when near light (see below)
    Fixed various issues
    Updated translations

    v0.734 Alpha

    • Added Spontaneous Blow Job system
    • Added camera shake when large ones are nearby
    • Roamer AI will break away after following you for awhile
    • Fixed (mostly) roamers not moving in shipping builds
    • Fixed lust refill from day cycle
    • Fixed free baths from Romy
    • Fixed typos
    • Updated translations

    Special Thanks to Translators

    • NealimeKenna (Dutch)
    • NiggoJaecha (German)
    • RubyRZND (Spanish)
    • Stringfish (Japanese)
    • FuzileiroGamer (Portuguese)
    • Pubro (Russian)
    • taVee (Thai)

    v0.729 Alpha

    Added:
    • New blur sheath and shader to hide dick seams (medium+)
    • Dick physics for breeder
    • Added ability to disable physics for performance
    • Gallery now displays all sizes for all variants
    • Language selection, first pass, still very WIP

    Note on Languages
    This first pass is crude, most of the UI cannot be translated yet and it will be a slow undertaking to expose it all. The only language available right now is simplified Chinese as it was generously contributed by patrons.
    Soon, I will open-source translations so that anyone can submit them, but keep in mind as the game progresses more dialogue will be added/changed and translations will need to be updated.
    Fixed many issues:

    • Harvesting milk alignment with huge Titan
    • Harvesting semen alignment with small Demon
    • Demon dick splatter mask
    • Full body splatter showing incorrectly
    • Sound volume not saved
    • Wild Nephelym stop spawning after 36:00
    • Breeder clothes/splatter reset at 36:00
    • Slime material black at angle, remember to adjust Skin Fade for your presets
    • Moon doesn’t occlude stars
    • Night too dark
    • Rename offspring doesn’t work with pregnancy
    • Possible to duplicate wild Nephelym on catching
    • Backspace function only works for a maximum of two characters before it stops working
    • Improved camera transitions to focus on head
    • Scrolling beyond max/min in scroll box affects camera
    • Fertile and Sterile not exclusive traits
    • Breeding tasks sometimes have impossible trait combos
    • Surprise menu showing in main menu
    • Large tree collision in Esoteric Glade
    • Various holes, collision, and places where you can get stuck
    • New offspring and catches don’t respect filters
    • Semen pool floats in NxM Cowgirl

    Added Presets Submitted by Patrons

    • Galatea by Sir Perry Grination
    • Mint Chocolate by Zolls79
    • Catiger by Neyo
    • Browny by Neyo
    • Cotton Candy Dark Elf by DotuLord
    • Female Cambion by Nghtly

    v0.729 Alpha

    Added:
    • New blur sheath and shader to hide dick seams (medium+)
    • Dick physics for breeder
    • Added ability to disable physics for performance
    • Gallery now displays all sizes for all variants
    • Language selection, first pass, still very WIP

    Note on Languages
    This first pass is crude, most of the UI cannot be translated yet and it will be a slow undertaking to expose it all. The only language available right now is simplified Chinese as it was generously contributed by patrons.
    Soon, I will open-source translations so that anyone can submit them, but keep in mind as the game progresses more dialogue will be added/changed and translations will need to be updated.
    Fixed many issues:

    • Harvesting milk alignment with huge Titan
    • Harvesting semen alignment with small Demon
    • Demon dick splatter mask
    • Full body splatter showing incorrectly
    • Sound volume not saved
    • Wild Nephelym stop spawning after 36:00
    • Breeder clothes/splatter reset at 36:00
    • Slime material black at angle, remember to adjust Skin Fade for your presets
    • Moon doesn’t occlude stars
    • Night too dark
    • Rename offspring doesn’t work with pregnancy
    • Possible to duplicate wild Nephelym on catching
    • Backspace function only works for a maximum of two characters before it stops working
    • Improved camera transitions to focus on head
    • Scrolling beyond max/min in scroll box affects camera
    • Fertile and Sterile not exclusive traits
    • Breeding tasks sometimes have impossible trait combos
    • Surprise menu showing in main menu
    • Large tree collision in Esoteric Glade
    • Various holes, collision, and places where you can get stuck
    • New offspring and catches don’t respect filters
    • Semen pool floats in NxM Cowgirl

    Added Presets Submitted by Patrons

    • Galatea by Sir Perry Grination
    • Mint Chocolate by Zolls79
    • Catiger by Neyo
    • Browny by Neyo
    • Cotton Candy Dark Elf by DotuLord
    • Female Cambion by Nghtly

    v0.728 Alpha

    • Added Fern phase 3.
    • Feed Fern 100 times and then wait for the next day.

    v0.727 Alpha

    • Added Fern phase 2.
    • Feed Fern 30 times and then wait for the next day.

    v0.726 Alpha

    • Added dynamic time of day system:
    • 1 Lyrcean day is 34 hours
    • 1 hour takes 1 real life minute
    • Fixed cum inflation not working with spirit form
    • Fixed cum inflation sometimes inflating futa givers

    Added Presets Submitted by Patrons:

    • Female Shark by Nghtly
    • Female Griffin by Nghtly
    • Pink Female Fox by Nghtly
    • Female Seraphim by Nghtly
    • Cranberry by Ashenine
    • DarkBlood by Cern89
    Images


    (Creator Mode is included. Check cheat for code.)

    Download

    Download For Win (v0752A)
    ANON *Older version but Wincest allowed!
    Download For Patch
    MEGA *This will restore incest to the game. **In general, you run this in the root folder of your Breeders of the Nephelym install (where Radiant.exe is) and it will patch the game. It will make a backup of the binary it patches (Radiant-Win64-Shipping.exe) and can also reverse patch (details in readme).

    REVIEW

    Pretty solid game. It keeps you interested with breeding function. Species inherit the behaviours and mixed up appearance of their ancestors. You go out of your ranch to jungle and monsters come to you, you have sex with them and after they cum you catch them, milk them on your ranch of breed them with other species. Females are kinda tricky to catch. Game looks smooth and beautiful(reminds me of Overwatch graphics).

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    Pretty solid game. It keeps you interested with breeding function. Species inherit the behaviours and mixed up appearance of their ancestors. You go out of your ranch to jungle and monsters come to you, you have sex with them and after they cum you catch them, milk them on your ranch of breed them with other species. Females are kinda tricky to catch. Game looks smooth and beautiful(reminds me of Overwatch graphics). Breeders of the Nephelym [v0.766.1 Test] – Download | DerelictHelmsman