Orichalcum is combination of all five of the True elements - earth, fire, water, wind and wood.
It manifests as a special type of true earth, similar in colour and texture to gold shot through with an opalescent sheen.
It can be created by taking a kernel of True earth, heating it with True fire which is fueld by True wood and bellows that pump True air, then cooled using True water. It also occurs naturally near veins of True earth and can be mined, but this is extremely rare.
It was sought after in great quantities prior to the Scourge for use in the construction of kaers. It amplifies the effects of magic and is used to fuel certain magics and in the crafting of magic items.
Wars have been fought over access to orichalcum in the past, and it is still highly valued in the present time.