Now coming in many varieties such as fire, ice, poison, etc. They were the easiest for wizards to tamper with, being the simplest beings, and have become far more populous than in previous times, definitely migrating from living only deep underground in the darkness. More appear when you kill them, so watch out.
The Camouflage Slime changes its color to blend with the block it's standing on. Element unknown.
They are known to be related to the Rainbow Slime, and very elusive.