Magma

Where Earth meets Fire and stone gives up being solid. Magma is the opposite condition to Ice in the strict sense the cosmology uses: both are two elements mixed, and the pairs are chosen to cancel.

Snaga the Abusive holds it. The Iron Lord, Lord of the Forge, whose portfolio is artifice and creation and mastery over metal. Smiths invoke him over finished work, and the invocation is practical rather than devotional: a blade blessed in his name is understood to have been made better, not luckier.