Skeleton Lord

The Skeleton Lord is a creature made of fused skeleton and body parts, with sinew and blood connecting it together. It is a master of necromancy.

In-game
The Skeleton Lord is an undead monster in Diablo IV, apparently as a boss. He summons skeletons and bone walls, while leveraging a giant staff that impacts the ground, creating a shower of exploding bone shards that blind the player.

Development
The Skeleton Lord was conceived as art first, with the design team subsequently using the art as inspiration for his fight. At BlizzCon 2019, it was called the "Tomb Lord."

Trivia

 * The Skeleton Lord appears similar to the Skeleton King from previous games. Both wield staves/maces, both summon skeletons, and both are lords/monarchs.