Minecraft Dungeons:Raid Captain

Raid Captains are new Mini-Bosses coming to Minecraft Dungeons with the new Hidden Depths update. They spawn in Mainland locations as a new type of mini boss that when defeated will drop something special The mission will greatly increase in difficulty once they are defeated and the loot of the level will be better.

Trivia
In the Hidden Depths Dlc trailer you can see a Diamond armored pillager that is a raid captain. We're aren't sure what does it drops upon death except emeralds, gold and TNT They change ur difficulty when defeated. Gamchangers
 * It's quite possible these mobs will work similarly to Ancient Mobs.