The Igneous Blade is believed to have been formed within Phoenix's solar crucible. Legends tell of countless swordsmen consumed by the sword's power, blazing husks without souls, left alive only long enough to pass it to its next wielder.
When Yurnero claimed the sword in the Desert of Misrule, he fought a spiritual battle with the blade's will for days, and while it claimed a part of him, his tempered discipline tamed it to his will.