Thanks all. It's killing me; I haven't had any name "jump out" at me yet (which is what I'm looking for).
Some good words for "master"...
I kinda like "Scion of Darkness" or "Scion of Death". Something long-ish, as opposed to just one word (because most of the others are only 1 word).
(or the "Fourth Horseman". :P)
Oh, in case anyone wonders/cares, I haven't "dried up" of ideas or "gotten bored"; just been a busy several weeks (mid-term papers, speeches in church, etc). Perhaps next week I can crank another topic out. It'll be great! :P