Slime Breeder Advanced will add new types of slugs for you, which can then be crossed with each other and get new ones. Drop mobs will depend entirely on their color: you can get from the usual carrots and right up to the diamond!
How to install Slime Breeder Advanced Mod
- Download and install Minecraft Forge
- Download mod
- Do not unzip it, copy to C:\Users\User_Name\AppData\ Roaming\.minecraft\mods