Skeletor

The Skeletor is a strong Skeleton which spawns in the Catacombs from 3 dead Skeletons dropping their skulls in a 3-block radius.

Spawning
The Skeletor spawns in the Catacombs on Floor III and above. It is spawned when 3 Skeleton-type mobs die and drop their skulls within a 3-block radius. When its spawning conditions are met, an animation will play showing the 3 skulls merging and the Skeletor will spawn.

Drops
The Skeletor drops Skeletor Armor.

Behavior
The Skeletor is hostile to all players. It will target the nearest player and run towards them at speed. It first throws its bow at players and then rushes in to melee at players holding a bone. Both the ranged and melee attacks deal heavy damage and True Damage.

Trivia

 * Killing a Skeletor while its bow is in mid-flight will neutralise the bow, causing the player to take no damage from it.
 * The Skeletor is possibly named after Skeletor, the main antagonist of the Masters of the Universe series.