Oni Xenotype Mod adds a new Oni xenotype and its own faction to RimWorld. This mod is a Biotech version of the original mod Oni of the Rim.
The mysterious horned humanoids known as Oni, found on some rim worlds, are often sought after by Glitterworlds for their beauty, treated as exotic pets. Even worse, some are kept as livestock for their horns, prized for both practical and decorative uses. Oni have little regard for clothing due to the discomfort it causes them. They possess the ability to spew dark flames, an inheritable gene passed down through generations. However, their dark fire is weak to light, thus their vulnerability to light makes them highly susceptible to being set ablaze.
Their true potential remains hidden from outsiders, guarded by ancient, secretive traditions. But when blessed by a shinigami, the latent hatred within them awakens, unleashing their inner power.
Oni Xenotype Mod Features
- A new Oni xenotype with unique abilities.
- Two new types of fire: Dark Fire and Curse Fire.
- Unique Kaigan ability that comes with powerful effects and significant drawbacks.
- Oni Fragments, an important resource for crafting incendiary items and weapons.
Dark Fire
Dark Fire is dangerous when attached to a pawn, causing creatures to bleed. It cannot be extinguished by normal means but can be put out by nearby light sources like torches, light stands, or campfires. Dark Fire is considered a lesser fire because it vanishes automatically, and its spread interval is twice as rare as normal fire. It is primarily caused by the ability “Dark Fire Spew,” but it can also be used in incendiary shells and IED traps made from Oni horn fragments.
Curse Fire
Curse Fire is far more destructive and can only be extinguished by sunlight. The burns it causes are permanent, and it can only be ignited by the ability “Amaterasu.” Unlike other fires, Curse Fire does not spread, focusing intensely on a single point.
Kaigan Ability
The Kaigan ability is incredibly powerful, providing major stat boosts, but it comes with significant drawbacks. Overuse builds up “Syarin Heat,” leading to symptoms affecting the eyes and consciousness. Continuous use for about 50 seconds causes the pawn’s eyes to scorch and take gradual damage. Side effects can be mitigated by closing the eyes by reusing the ability, but caution is advised.
Oni Fragments
Oni fragments are crucial in this mod. You can collect them when Oni colonists shed them, but it’s easier to kill an Oni, extract their horn, and break it into fragments.

















Compatibility notes
- Oni Of The Rim is likely incompatible due to potential duplication issues. It’s recommended not to play with the original mod.
- Mods that modify the burning method may be incompatible due to custom transpiling. This is a temporary issue that will be fixed in the future.
Credits
Author of the mod: Grandfather.
Art in the mod page, textures, XML, and C# coding by Grandfather. Some textures and descriptions are inherited from the original mod.
Additional credits:
Tarojun – Maintains “Oni of the Rim” and gave permission for this fork.
Ameiro – Original artist, concept, and author of the animal mod “Oni”.
MoriShep – Converted the animal mod into an alien race mod.
Lucky – Worked on textures for a period of time.
BlackMarket420 – Commissioned for new guns and projectile textures.

