The Grecian Automaton is an enemy that spawns in Marble Caves after Hard Mode has been unlocked. It will attempt to fly at the player; rather than flapping slowly like a Slimer, it will make sudden, lurching dashes when in close range.
The official Discussion and Voting threads can be found here and here!
Sprite of the Week
Congratulations, Terraria57! Your sprite, Dreadmaster, is the Sprite of the Week!