Kull the Conqueror
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The particular version I'm reviewing is by VRE Publishing (not Tor) - containing the following stories
The Shadow Kingdom
The Mirrors of Tuzun Thune
Kings of the Night
In the first, Kull has to battle serpent-men trying to take over his kingdom, with the aid of Brule (who then becomes his right hand man).
The second is a very short story, less action and a lot more philosophizing about what is real or imaginary (maybe an influence of Michael Moorcock's Elric novels)
The third is set in Roman Britain, and Kull magically appears to help Bran Mak Morn hold his lands from an invasion.
It's pretty much what you'd expect from an REH book - steely eyed hero, preferring action to being a king, going off and having adventures.