• A slime is a rare mob, which can spawn in three different sizes: big, small, or tiny. A slime will split into two smaller slimes when killed, unless the slime is already the smallest size. Behaviour. Slimes can only be found in Swamp Biomes, below layer 40 (in 1 / 10 of all chucks), or in Superflat worlds. read more
Before building a slime farm, first decide whether to build it in a slime chunk or swamp biome. Every chunk that is generated in a world has a 10% chance of being a slime chunk. Within slime chunks, slimes can spawn up to Y=39 inclusive. read more
Slimes spawn in the Overworld in specific "slime chunks" below layer 40 regardless of light levels. They can also spawn in swamp biomes between layers 50 and 70 in light levels of 7 or less. Only sizes 1, 2, and 4 spawn naturally. read more