Telos

The Master of the Iron Sky, known as Telos in most tongues, was a primordial who fell to the tundra of Vaasa during the Spellplague.

He remained there, comatose, while the Warlock Knights mined what they called ironfell or "the iron" from his body. This material, which regenerated quickly, was used by the Knights to fashion items and constructs they called shardsouls.