Should be able to summon Seraph or Herald boss with those angel statues. Maybe a full chest would make one descend from the sky, or on a floating island. Boss music would sound like some kind of holy chorus mixed with a guitar.
It would shoot lasers from the sky, arrows and push players back with a melee attack. It also constantly spawns angels guards. It'd probably drop a godly bow, lots of feathers and a halo vanity item. it could also be able to heal itself from time to time.