From Elemental Lords of Porphyra

Gauntlet of Drothos
Aura moderate evocation; CL 8th; Weight 1 lb.
Slot weapon; Price 25,000
This single heavy gauntlet gives off a palpable heat. It counts as a +1 spiked gauntlet for weapon proficiency, and does the same damage, plus 1d6 fire damage. On a critical hit, the target is coated in magma, doing 2d6 damage the first round, and 1d6 on the next two rounds unless the target is doused with water. Additionally, the hand wearing the gauntlet of Drothos can handle materials at high temperatures and not be affected.
Requirements Craft Magic Arms and Armor, resist energy, lavacall; Cost 12,805