| Category | Resources |
| Type | metal |
| Source | natural - Forge Worlds, very rare - Gelugon Range |
Tantulhor is a vibrant crimson metal, similar in weight to iron. It can be wrought into a smooth finish and is purported to render a weapon unbreakable. Weapon blades crafted from this material will slice through nearly any substance they encounter, save for stone. This metal occurs naturally only on the Forge Worlds. When tantulhor is forged in Hellfire furnaces, it tempers greatly, granting items three times the hardness and twice the durability of iron.