Terraria - The Destroyer v 1.2.3.1
So they buffed The Destroyer for 1.2.3 a little. I had to go as far as farm Hallowed set with Twins and Skeletron Prime before this boss, as they are easier. But that makes this boss more than doable, and especially the Cutlass from pirates.
Just to be clear that i don't need potions for this fight, i put them in piggybank at the beginning. Actually i forgot to even use the ironskin and regen :D But it was still fine.