1001 Slimes

Publisher's blurb:

Do your players know the abilities of every single slime-like monster in your game by heart? Let them meet one of these 1001 Slithering Slimes and they'll never know what hit them. Or slimed them. There are slimes of every color, size, and description, with different special attacks, defenses, and vulnerabilities. They have special features, as well, ranging from glowing in the dark to throwing pieces of themselves as missiles.