Hello!!!! The Armored Drowned is a hostile mob and a Drowned variant added in the Hidden Depths DLC that acts as more defensive variants.

information: https://minecraft.fandom.com/wiki/Minecraft_Dungeons:Armored_Drowned

Appearance:

the second variant is more paler blue, having pale blue skin and small wound like patches on its head and legs and wearing chain armor and dark bluish-gray tattered clothes. The pale variant is seen holding an Eternal Knife, while the dark green variant holds a Soul Knife.

Behavior:

Like armored zombies, they are sluggish and capable of hitting the player with melee and spawned weapons, as well as having increased defense.