Well firstly if you're on a corrupt world you'll wanna farm souls of night for corrupt mimics. Putrid scent and dart rifle are insanely good. Dart rifle with cursed darts will clear destroyer easily and is better than Daedalus with holy arrows since the nerfs to both of those items, Daedalus is still viable but better with unholy arrows now. Any of the hardmode ore armors work, mythril has the best damage but is very glass cannon, orichalcum has a good set bonus for destroyer, titanium has good close up crowd control, adamantite is an all rounder good damage set, and palladium has good regen. Don't bother with cobalt it has no interesting qualities. For premech star veil is a must it can be easily obtained with cross necklace and star cloak both from base mimics.