Bloodstone
Dark Crusade
Darkness Weaves
by Karl Edward Wagner
http://en.wikipedia.org/wiki/Kane_%28fantasy%29
My favourite book would be
Darkness Weaves, but it's
Bloodstone that really makes Kane fit. Kane is trying to take over the world using a strange artifact (AI) of elder civilisation (the Bloodstone). It is located within ruins inhabited by
degenerated members of the civilisation. They look remarkably
frog-like and posess great strenght. Kane ends up subduing them and using them as an army.
So, basically, Kane would show up in late Atlantis pursuing his own goals and schemes.
Maybe it's just me, but I
really enjoyed the novels. In any case, read them. The athmosphere is so thick and dark it's comparable only with Hexen (game).
For other lovecraftian references, read
Darkness Weaves.
If you don't put him in, you'll break my heart.