Tu-Mal, The Heart of the Forge

A Destined Weapon, Tu-Mal was crafted by Julius Von Parvel during his trial of the forge against Daedalus. After many failed attempts to create a superior item, Julius found the resolve to continue his quest, and eventually allowed himself to forge a weapon without thinking, resulting in Tu-Mal.
=== Effects ===
Upon its creation, Tu-Mal is instantly attuned to the smith who forged it. Unless the weapon is somehow destroyed, or the attuned user dies, it cannot be unattuned to.
While Wielding Tu-Mal, melee weapon attacks made with it deal an additional 2d6 points of Fire damage.
Additionally, whenever you take fire damage while wielding Tu-Mal, you gain 1/4th of the damage rolled as Temporary HP, even if you are resistant or immune to fire damage.
=== History ===
According to Daedalus, long ago, a weapon named Tu-Mal was forged in the Elemental Plane of Fire. It was said to have slain countless foes, until it was destroyed a year later. Since then, the trial of Tu-Mal has been held every century or so, with smiths from both the plane of fire and otherwise attempting to forge an item to live up to the legacy of the original Tu-Mal. Apparently, the previous Tu-Mal was not even a weapon, but a fiery dragon of ash and fire.
According to Daedalus, if one was to craft the next "True Tu-Mal", they would know.