The weapon has been imbued with the Blessing of Fire, drawing power from the Molten Shamanstone. The Frozen Shamanstone should impart the next blessing. Argoram mentions its location in his journal:
"As I was maneuvering away from the great boulders hurled at me by the ogron brutes, I glanced what looked like another monolith atop the tallest of the snow-capped towers in Bloodmaul. Perhaps this is the Frozen Shamanstone, which is thought to grant the Blessing of Frost"