Minecraft Dungeons:Skeleton Horseman

A Skeleton Horseman is an undead miniboss that can spawn randomly in various levels $$.

Spawning
Skeleton Horsemen spawn on Adventure mode and above, and spawns randomly in groups in the Creeper Woods, the Soggy Swamp, the Pumpkin Pastures, the Cacti Canyon, the Redstone Mines, the Desert Temple, and the Overgrown Temple. In Apocalypse difficulty, they also spawn in the Fiery Forge. They can also be found early on Default Mode uncommonly in the Cacti Canyon.

Behavior
Whenever a player approaches a newly-spawned Skeleton Horseman, it transforms into the Four Skeleton Horsemen and start charging at the player. The Skeleton Horsemen also have high hit points and require constant damage to be defeated.