I have been trying to remember these FOR YEARS with no luck. I read these no later than the mid to late 90's though I don't know if they were new/old at the time. I have only vague memories of plot and characters apart from remembering they were enjoyable. I think there were at least two books, but it could have been 1.
The only specific detail I remember that might be unique is of an elite group of troops that had been magically castrated, leaving testicles to promote aggression but only a small nub instead of a penis, and each troop was given a straw (gold maybe?) to use to pee through with the nub.
I think a villain may have been termed an Archon, or maybe that was in the title? I don't know and could be completely wrong.