Slippery Shinobi

King Slime spawns from a Slime Crown (20 gel + a gold/platinum crown at a Demon altar), during Slime Rain (Sticky Situation), or very rarely in the outer thirds of the map. He's a pushover with any ranged weapon: stand on a platform and shoot down, mind the spawned slimes, and mop up. Drops the Slimy Saddle - a genuinely useful early mount for The Cavalry.