User blog comment:Prof. Draco/Invent a Wesen/@comment-5914541-20130712211008/@comment-4273152-20130718224559

Neither Hades nor Pluto ever had any connection to lava or fire, that was the realm of Hephaestus. Hades sphere of power was the realm of the dead, the afterlife and the riches of the earth (i.e gems and ores.)