Armored Skeleton

The Armored Skeleton is an underground monster that resembles a skeleton, but in armor. Appearing only during Hardmode, the Armored Skeleton has additional hitpoints and increased attack damage.

They often appear alongside the Skeleton Archer.

They also have a chance to induce the Broken Armor Debuff.

Trivia
The Armored Skeleton appears to be wearing the old Cobalt Breastplate model.

It has been reported to drop souls of might upon death.