Remember that I mentioned an emphasis on the undead in the Monsternomicon?

Keep your cleric handy:

Boatman Progeny
Black Troll
Disembodied
Dread
Eldritch
Sythyss
Excrutiator
Hollowed
Iron Lich
Mechanithrall
Pistol Wraith
Sepulchral Lurker
Shaft Wight
Swamp Shambler
Thrall
-Risen
-Slave
-Lieutenant
-Bane
-Skarlock

And that doesn’t count the various abberations that quite frankly would at first glance be thought to be undead by any reasonable party. Glue a holy symbol to your gaunlet, lad, and get jiggy with the restless deceased!