This is a fantasy novel which I read around 1990, so it would have been published before that. As far as I remember it was stand-alone and not part of any series.
I don’t remember the title or the name of the author. The basis plot is as follows:
The protagonist is a demi-god with powers over fire and metal. He is chosen as the champion of a kingdom about to go to war. There is another champion who I think may have been a dwarf. The good guys are helped out by some waif-goddess type (think Aphrael from the Elenium).
The bad guys are led by an evil god, descended to earth, bent on world domination and what not. There are some battles and a quest of some kind. I vaguely remember some necromancy happening.
I know it’s not much to go on, but I’m hoping a Doper can recognize the story.