The Scattered Seed (Shadows of Lucifer, #1)

Lucifer, an Immortal, relegated by the Gods to Pluto (the Plane of Penalty) after the War of Fire, can see that the humans on the Nine Planes are moving toward another terrible war.
The Gods, as usual, are detached and disinterested in mortal affairs, but they have restricted Lucifer's ability to interfere.
The Argenti, a sect of women that arose after that war, have learned to harness the magic energy inherent in the fine metals. Devina, the Argenti ruling queen, is determined to finish off ...