King Slime

King Slime is a Pre-Hardmode boss in Terraria. He can be summoned by using the Slime Crown or defeating 150 slimes in the Slime Rain.

Appearance
The King Slime is a giant blue slime with a crown on top and the ninja set inside.

Achievement
Slippery Shinobi - “Defeat King Slime, the lord of all things slimey.”