Necromium

Not to be confused with Necronium, a tier 70 metal designed by Kohilaice in KOHI2807152. Necromium is a pale green-grey metal, known for its use in the Barrows’ equipment. It can be created at 70 Smithing skill by smelting Necrolith ore, three pieces of Imcandite and one heap of Boneflux in a Heat-resistant furnace granting N/A experience. The Blast Furnace is already strong enough for Imcandite smelting without needing an upgrade.

The soul trapped in a piece of Necrolith ore will struggle and resist. The Boneflux is used as a kind of anaesthetic to temporarily placate the trapped souls and ease the fusing of shards of Necrolith. After being fused into bars, and further into equipment, the souls act as a hive-mind, continuously pulling on one another and keeping the metal together through enormous artificial surface-tension.