Black Slime

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.

Black Elemental Slimes are like normal Slimes, except they've been magically imbued with random elemental properties. (later will change to physical resistance)