Skeleton Master

The Skeleton Master Is a Dungeon Mob that spawns on The Catacombs - Floor II and above. Like other ranged mobs, like the Skeleton Soldier, it attacks with its bow. However, if its target gets too close, it launches a wither skeleton skull that deals.

Respawning
When it dies, it turns into a skeleton skull. If there are 1 or 2 skulls nearby, they are merged, and an Undead Skeleton will spawn. On The Catacombs - Floor III and above, 3 skeleton skulls merging together will form a Skeletor. On The Catacombs - Floor VI and above, it can rarely turn into a Skeletor Prime.

Trivia
The wither skulls fired by skeleton masters at close range do 400-600-800-1100-2500-4200(based on floor), making them extremely deadly when you are against multiple of them.