Goobermunch
Explorer
Skulls for the skull throne!Blood for the Blood God!
Skulls for the skull throne!Blood for the Blood God!
Blood for the Blood God!
I think you could do a lot worse than bring in Nurgle - of course, using all four Chaos Gods from Warhammer could turn the campaign in an interesting way, too.
I thought disease was somewhere under Jubilex's portfolio.