Nebby-VarianceAPI icon


A Continuation of Rob's MonsterVariants, VarianceAPI lays down the groundwork for virtually anyone to create their own variants. Now with a proper ReadMe file.

Last updated a week ago
Total downloads 3826
Total rating 3 
Categories Mods Tools Libraries Artifacts
Dependency string Nebby-VarianceAPI-0.8.0
Dependants 3 other mods depend on this mod

This mod requires the following mods to function

tristanmcpherson-R2API-3.0.30 icon

A modding API for Risk of Rain 2

Preferred version: 3.0.30
bbepis-BepInExPack-5.4.9 icon

Unified BepInEx all-in-one modding pack - plugin framework, detour library

Preferred version: 5.4.9


Variance API

  • A Complete Re-Write, altho heavily based off Rob's original MonsterVariants code.

  • VarianceAPI aims to combine the features from MonsterVariants and MonsterVariantsPlus into a single mod.

  • The API by itself doesnt do much, it only works as a base for others to create their own Variants


Thunderkit support

  • VarianceAPI was made with Thunderkit, and it's systems are made to be used with Thunderkit. it is Extremely recommended to use Thunderkit when Developing VariantPacks

  • Despite this, Variants can still be added via code. Only examples currently lay on the Deprecated ExampleVariantPack. The mod comes with a Helpers.cs class that has methods on creating the ScriptableObjects that VarianceAPI requires

  • Easily create Variants using the plethora of ScriptableObjects VarianceAPI has!

  • Plus, VarianceAPI contains base classes for easing the creation of variants.

    • Automatic ConfigCreation using the VariantConfig scriptable object.

    • Semi-Automatic fetching for Ingame materials, no more AssetBundle bloating!

Better VariantOverlapping methods

  • The confusing and sometimes obscure VariantOverlap system has been expanded and now can be either Avoided, or encouraged.

    • Each Variant has a Unique boolean, Which determine wether the Variant can participate in VariantOverlapping shenanigans

    • The IsUnique boolean is part of the ConfigFile, so if you do not want a variant type to overlap with others, it's as simple as setting it to true.

    • Each Variant can either add Suffixes or Preffixes to an Enemy, this allows you to easily identify Variants on the spot with a simple ping, and getting an idea in your head on what they can do.

New Improved VariantHandler component/Variant Features

  • Variants made in VarianceAPI have:

    • All the original features of the VariantHandler component, alongside...

    • Custom name prefixes and affixes

    • Wether the variant gives rewards

    • Configurable Rewards

    • New Tiers

    • Ability to add Completely custom Components

    • DeathState replacements

    • LightRendererInfos replacements

    • The Ability to use Equipments

    • Can spawn with Buffs/Debuffs (NYI)

New VariantRewardHandler component.

  • All of MonsterVariantsPlus' Rewards systems are now handled by this nifty little component that's added to each Variant that has the "GivesReward" boolean set to true.

  • Only one VariantRewardHandler component is given to each Variant. the mod does it by checking how many VariantHandler components are active at the time.

  • Just like in MonsterVariantsPlus, Variants by default now:

    • Drop extra Gold on death

    • Drop extra XP on death

    • Have a chance to drop items, Red, Green or White respectively

  • Also just like in the original MonsterVariantsPlus, all of the rewards are calculated based off the Variant's Tier, and can be modified

  • If youre not a fan or rewards, the VariantHandlerReward system can be easily turned off with a simple boolean in VarianceAPI's config file.

Artifact of Variance

  • The Artifact of Variance, one of the Features from MonsterVariantsPlus, is now a core component of VarianeAPI.

  • The Artifact of Variance, when enabled, multiplies all Variant's spawn rates by the amount specified in the Config file.

  • Just like in the Original MonsterVariantsPlus, the Artifact of Variance can be enabled or disabled in the Config file.

Intrinsic Items for Variants

  • VarianceAPI comes bundled with KomradeSpectre's ItemModCreationBoilerplate.

  • Due to this, VarianceAPI comes bundled with Intrinsic items that've been created for exclusive use for Variants.

  • These items are AI Blacklisted, meaning that Enemies in the void fields will never get this item, and they should never appear in a normal run (if otherwise please contact me!)

  • These items are...

    VAPI_GlobalCDR: Reduces all cooldowns by 1% linearly per stack
    VAPI_PrimaryCDR: Reduces the Primary's cooldown by 1% linearly per stack
    VAPI_SecondaryCDR: Reduces the Secondary's cooldown by 1% linearly per stack
    VAPI_UtilityCDR: Reduces the Utility's cooldown by 1% linearly per stack
    VAPI_SpecialCDR: Reduces the Special's cooldown by 1% linearly per stack
    VAPI_ExtraPrimary: Adds an extra primary use per stack
    VAPI_ExtraSecondary: Adds an extra secondary use per stack
    VAPI_ExtraUtility: Adds an extra utility use per stack
    VAPI_ExtraSpecial: Adds an extra utility use per stack
    VAPI_PurpleHealthbar: Makes the healthbar purple, automatically given to any variant who's tier is Uncommon or higher.
    VAPI_Plus1Crit: Increases critical strike chance by 1% per stack linearly.

Official Variant Packs (Variant Packs made by Nebby)

The Original 30

  • The original 30 is a complete port of Rob's 30 original MonsterVariants.

  • The original 30 includes QoL changes to variants, such as using VarianceAPI's intrinsic items, and having new features such as slight rebalancing and better override names.

  • Get it here! (just click the icon!)

TO30 Icon

Nebby's Wrath

  • Nebby's Wrath is a complete port of all the non-"OtherVariants" of MonsterVariantsPlus.

  • All the non "OtherVariants" encompass all variants except the ones for Squid Turrets, Empathy Cores & the Beetle Guards froms the Queen's Gland.

  • Get it here! (just click the icon!)

NW Icon

Nebby's New Friends

  • Nebby's New Friends is a complete port of all the "OtherVariants" of MonsterVariantsPlus

  • Currently the pack is nonexistent, but it will eventually come out.

  • Get it here! (just click the icon!)


  • Nebby still suggests checking out other VariantPacks made by the community! (Currently none :c)

Official VarianceAPI discord server.

  • VarianceAPI related discord server, you can join in here to meet other variant pack creators or learn how to create your own.

  • Currently barebones, will start getting some love soon


- Continue development of the API



  • Added Functionality to Legendary Variants (They'll announce their arrival in Chat.)

  • Fixed bug that caused Variants with no VariantInventory to not recieve their purple healthbar if the tier was greater than common.

  • Added Support for Modded Variants.

    • VariantConfig now has modGUID string.

    • This string MUST match the mod's internal GUID.

  • VariantInfoHandler now has a failsafe when you attempt to add a Variant without the mod installed.

  • Removed completely ItemInfos


  • Changed how inventories work.

    • Inventories are no longer an Array of ItemInfos, instead, inventories are stored in the VariantInventory scriptable object.

      • a VariantInventory scriptable object consists of a itemStrings array, and an itemCount array.

      • The itemString's index must match the itemCount's index.

      • The lengths of both arrays MUST be the same.

    • Removed helpers that created ItemInfo Arrays, new helpers comming soon.

    • Due to this switch, ItemInfo[] is deprecated, but it will remain in VariantInfo so that people can switch to the VariantInventory scriptable Object.

    • ItemInfo will be removed on the next major update (0.8.0)


  • Added PrefabBase, a very simple prefab creation system used for creating Projectiles based off existing ones.

  • Added missing R2API Submodule dependencies.

  • Changes to the VariantInfo scriptable Object:

    • usesEquipment no longer exists.
  • Internal changes to how VariantHandler is structured.

  • Added a new Component, VariantEquipmentHandler.

    • Component is added automatically to the Variant when it detects that EquipmentInfo has an Equipment and is not null.

    • Component is used for Variants so they can use Equipment.

    • How the variant uses the Equipment is based off an Animation Curve

    • Special Thanks to TheMysticSword, since he helped me in using the AnimationCurve and most of the code is based off his code from AspectAbilities

  • Changes to the EquipmentInfo scriptable object:

    • Now requires an AnimationCurve which tells when to use the Equipment.


  • Added missing methods for Helpers.cs

    • Added method for creating VariantOverrideNames

    • Added methods for creating CustomVariantRewards

  • Added the first iteration of the MyVariantPack boilerplate

    • Boilerplate is installed thru a unity package that you can install when youre developping in Thunderkit

    • Boilerplate code fully documented.

    • Boilerplate includes the following examples:

      • Creation of a Variant in code

      • Creating a Variant in Thunderkit

      • Communicating with VarianceAPI

      • Using the VariantInfoHandler to register variants

      • Using the VariantMaterialGrabber to grab vanilla materials.

  • All logger messages now use the Bepinex Logger instead of the Unity Logger.

  • Added KomradeSpectre's ItemModCreationBoilerplate to VarianceAPI.

    • Added a version for creating items in thunderkit, alongside the default one that uses R2API.

    • As listed above, VariantAPI comes now with Intrinsic variant items that are used in VariantCreation

  • Fixed the VariantRewardHandler not being as close as possible as the original rewards system

  • Added the Ability to replace Light colors in BaseLightRenderer infos of a CharacterModel.

  • Changed config creation process, only the section version.

    • Now each config section follows the following format:

      *variantInfo.bodyName + " variants"

  • Uncommon Variants now use a Purple healthbar instead of a Red healthbar thanks to the new intrinsic items.


  • Added back the Artifact of Variance

  • Fixed issue in VariantHandler causing certain stat multipliers not applying

  • Added a PreventRecursion system. Variants may not recieve extra Dio's Best Friends when resurrecting.

  • Added Custom Death States

    • Custom Death State can be specified in the VariantInfo Scriptable Object.

    • Leave it null unless you know how to get the required string to make it work.

  • Removed no longer needed classes

  • Added an identifier to VariantMaterialReplacement scriptable object.

    • It's main goal is to help with creating VariantMaterials in Thunderkit.
  • Added the base class VariantMaterialGrabber.

    • Works by loading all the "incomplete" VariantMaterialReplacements in your AssetBundle.

      • An incomplete VariantMaterialReplacement has it's material set to null, and has it's identifier filled.
    • Proceeds to then compare the incomplete versions with complete ones made in code. if it matches one, it'll replace the material with the correct one.

    • TL;DR: This class helps reduce bloated AssetBundle sizes by allowing the player to fetch ingame materials instead of copying them and placing them in their AssetBundle.


  • Changes to the OverrideName system

    • Added a new enum which enables the OverrideName to completely override the variant's baseName.

    • System now works with a switch

    • Renamed overrideOrder to overrideType

  • Added a new Array in VariantInfo for VariantExtraComponents

  • Added a new ScriptableObject called VariantExtraComponents.

    • VariantExtraComponents can be used to add a custom component to a specific variant when it spawns

    • This component must inherit from the new VariantComponent component found in the api (VariantComponent inherits from MonoBehaviour)

    Has the following settings:

    - string componentToAdd: The component to add to the Variant. this must be the combination of the Namespace of the component, alongside the class name. For example: TheOriginal30.VariantComponents.AddMissileLauncherToLemurian
    - bool isAesthetic: Wether the component to add just adds a mesh to the original body.
    - Non aesthetic components support haven't been added yet.
    • Used in TheOriginal30's Badass lemurian to attach the Missile Launcher.
  • Added discord server to the ReadMe

  • Hopefully fixed broken icon.


  • All of VarianceAPI's ScriptableObjects have Headers and Tooltips, making it easier to create the objects in the UnityEditor

  • Complete Rewrite of the Variant Overridename feature. now supporting VariantOverlaps.

  • Did a Facelift of the Thunderstore page.


  • VariantInfo now contains VariantConfig scriptable object, VariantConfig is used to create the config entries for your Variants.

    • VariantConfig allows you to:

      • Set the spawn chance of a Variant.

      • Wether the variant is unique or not.

  • Removed VariantRegisterBase

  • Added VariantInfoHandler, use this now to register your variants, as it streamlines the process.

  • Added Helpers for creating VariantConfig Scriptable Objects in code, one for Vanilla entities and another one for Modded entities.


  • Forgot to call the method that makes the config, whoops.


  • Added the VariantRewardHandler Component, officially porting a good chunk of MonsterVariantPlus' Features.

  • Added VariantRegisterBase, a helper for easily register variants made in Thunderkit.

  • Added Config file with a lot of config entries for the VariantRewardHandler and global settings.

  • Started working on a helper for creating Variant's Spawn Chances via config

  • Determination++ After learning rob likes what i'm doing.


  • Added Github Link.

  • Made changes to the scriptable objects, now they can be made in Thunderkit instead of on RunTime.


  • Initial Release

Available versions

Please note that the install buttons only work if you have compatible client software installed, such as the Thunderstore Mod Manager. Otherwise use the zip download links instead.

Upload date Version number Downloads Download link  
2021-6-16 0.8.0 1790 Version 0.8.0 Install
2021-6-14 0.7.1 366 Version 0.7.1 Install
2021-6-13 0.7.0 328 Version 0.7.0 Install
2021-6-9 0.6.0 554 Version 0.6.0 Install
2021-6-7 0.5.0 275 Version 0.5.0 Install
2021-6-6 0.4.0 157 Version 0.4.0 Install
2021-6-5 0.3.0 185 Version 0.3.0 Install
2021-6-3 0.2.0 64 Version 0.2.0 Install
2021-6-3 0.1.1 25 Version 0.1.1 Install
2021-6-3 0.1.0 5 Version 0.1.0 Install
2021-6-2 0.0.2 35 Version 0.0.2 Install
2021-6-2 0.0.1 42 Version 0.0.1 Install