Credit goes to LordCakeSpy, not me. He made this for a scrapped mod and gave me permission to use this for a mod i am making. The original title for this was “Cultist Faction theme”.

Anyway, Onto the Creepy boss. The theme this is for is a boss known as the Impostor, A boss that changes its attacks almost constantly. The Impostor will replace one of your NPC’s, selling you Faulty Items designed to kill you. You have to figure out which one of your NPC’s has been replaced (There will be a hint if you take too much time). Once you’ve found the right NPC, You have to use an item Called the “Revealing Mirror” Near this NPC. Then Prepare for battle.

Yeah, so don’t expect this mod anytime soon.
And yes, this isn’t the final sprite, just a first take.