Special Dusts (Arcane, Divine, Supernatural, Apocalyptic, Infinity) are Items, which are crafted at a very high level to craft the most powerful Weapons and Armor.
Arcane Dust: Glowstone + Magic Crystal
Divine Dust: Platinum Ingot + Lava Crystal
Supernatural Dust: Snake Egg + Turtle Shell + Perfect Snake Hide + Turtle Poison
Apocalyptic Dust: Creeper Bone + Corrupted Crystal
Infinity Dust: Mystic Crystal + Magic Leaf