The King Slime appears randomly and can be found in caves, as well as on the surface. The boss can also be spawned by using the Slime Crown, which can be crafted from 99 gel and a Gold Crown at a Demon Altar.
It has 2000 HP when spawned. When you damage it, blue Slimes will break off of him and the King Slime itself progressively shrinks in size. It drops a random piece of the Ninja Set upon death.
![](http://images4.wikia.nocookie.net/__cb20120615154521/terraria/images/b/b5/Tiamou_Terraria_Fan_Art_King_Slime_Wallpaper.jpg)
![](http://images4.wikia.nocookie.net/__cb20120615154521/terraria/images/b/b5/Tiamou_Terraria_Fan_Art_King_Slime_Wallpaper.jpg)