While wandering the Deep Dark, you activate the Sculk Shrieker a bit too much, causing the Warden, one of the most powerful mobs in Minecraft, to spawn.

It roars insanely loudly and starts to turn its big head around looking for you. It's blind, but that doesn't make it weaker.

The souls in its ribs pulsate, it itself glows a little. Its mouth is wide open in an angry expression and its eyes are completely missing. It also has large horns and a massive body.