Simple, go Hoarde then you don't have to fight the Undead. ;) Rogues in general are pretty tough, because they hit so fast they can really ***** up your casts. If you see them coming, no problem, even if they go invis, you can stay away from them. I usually have my Succubus up, and if the rogue get's the drop on me I try and seduce them with the Suc (Heh). Even if they are undead, if you can stay alive long enough using your health stone, curse of weakness, etc, you may be able to get them charmed. Once they are charmed, your odds are pretty good. Then it just becomes the regular, fear, dot, blast away fest. You won't win everytime, but that's what makes it exciting.