Giant Cursed Skull

Nothing summons it. It starts spawning in the dungeon the moment Plantera goes down, and it clusters heavily in the sections walled with slabs and tiles. Other parts of the dungeon can produce one, but rarely enough that the wall type decides where you put a farm.

Its bolts pass through tiles, move fast, and always leave you Cursed. Cursed means you cannot attack at all while it runs, and being unable to swing in a post-Plantera corridor is worse than the hit that put you there. Touching it does the same, less reliably. The Nazar it can leave behind is the counter to its own signature attack.

It opens its mouth before firing and the shot can still be canceled in that window, so a fast weapon pointed at one that is winding up shuts it down. There is also a quirk: while it is buried in solid tiles it will usually hold fire until it drifts into the open. Hit it through the wall with a Nettle Burst or a Death Sickle and it starts shooting from inside the stone immediately.