This is about the aboveground hallow for the underground hallow click here(not done yet) Mobs that spawn in the hallow are Pixies, Unicorns, and Gastropods. Pixies drop Pixie Dust(who knew!) Unicorns drop Unicorn Horns(who knew!) and Gastropods drop gel. The Hallow is an Anti-Corruption as it slows the corruptions spread during hard-mode. Hallowed biomes have hallowed grass, pearlstone, and hallowed trees. The Hallow is usually preferable to the corruption because it spawns(slightly) less harmless mobs. Even so, a new player may find the hallow as murderous as the corruption. Pixie Dust is used in Greater Healing Potions, Holy Water, Holy Arrows, and Fairy Bell.