Slimes are one of the most basic threats possible in the Spires, and are the weakest monster in existence. Teardrop shaped creatures of gelatinous acid, that move by hopping. They have barely noticeable levels of intelligence.
When killed they drop grey mana crystals.
There appear to be different varieties of slime. For instance, giant acidic slimes have been seen in the tower, and dropped level 3 life mana crystals.
Slimes have also been seen eating other slimes, gaining size and speed from doing so.