Sigurd; he is concealing his necromancy. I have not yet decided where his actual lair is, but he owns a home in the Midtown area, and it might simply be beneath that. He's got only the BIAJ as an ally, but he's buying some of his victims from a very bad man down on the docks. And he's also buying corpses from the arena (animals and such), claiming to be a taxidermist.
The way the PCs stumble across him is a bit complex, but I'll try to describe it:
Weeks ago, the PCs were involved in a mission to retrieve a dead Litorian's body. The litorian had been killed in a barfight, and his body vanished. The necromancer had bought it, and taken it to a secondary lair where he was trying to build a flesh golem. The Litorian body was his main material. The PCs recovered the body, and rescued 3 people whom they then hired as servants. (They rescued more, but these 3 had nowhere to go). The PCs knew the real necromancer got away, but had no way to trace him (they were only 2nd level).
Now, they have been worrying over the apparent disappearance of street children in Midtown. When one of their servants comes home and reports that she SAW the necromancer escorting a shabby little boy into a home nearby, I'm sure they'll jump to the right conclusion! In truth, the necromancer HAS a son of his own, and is bringing the child home from a morning playing in the park (who says evil can't be nice once in a while?).
The PCs will probably run to confront the necro, who will simply try to grab his son and flee any attack. But they'll discover info that can lead them to the lair. They may get lucky and kill the necromancer, or they may not. They may even try to "adopt" his son, knowing some of my PCs. Good luck to them (he's very evil...).
But this is all outside the bounds of WHATS IN tthe lair, which is where my imagination hit a wall.
