Ultranium/Horror armor

Horror armor is a post-Moon Lord multi-headpiece set. It consists of the Horror Breastplate and Horror Leggings along with the four helmet variants for each class: the Horror Helmet, Horror Visor, Horror Hood, and Horror Mask. It requires 37 to craft a single full set. Crafting all four helmets requires 64 Nightmare Fuel.

Excluding the helmets' bonuses, a full set grants the wearer 15% increased damage, 7% increased critical strike chance, 8% increased melee and movement speed, +20 maximum health, +1 minion slots, and 5% increased damage reduction. Each helmet provides 12% increased critical strike chance for their respective class except the Mask, which increases summon damage by 10%. The armor's set bonus allows the equipped helmet's class to occasionally shoot dread flame bolts when used, as well as providing an additional bonus based on the helmet.