Beetle Armor, Celestial Shell (With warding), Berserker Glove (With warding), Fire Guantlet (With warding), Wings (With warding), Flying Mount (Of your choice), A summon for extra DPS (Can be anykind I do suggest a higher DPS one to help against high DEF targets), Terrablade (Or whichever melee weapon of your liking WITH the legendary modifier), Cursed/Ichor flasks for extra DPS, Food items (for some extra help), Ankh Shield (With warding), Starveil (With warding), and good healing potions. These have all worked fairly well against the cultist for me.