[thejeff]

Call spirits is the right order.

Only your unholy priests can do it. There's a table in the manual showing numbers. If you call the weakest type (Dispossessed spirits) you should get more than one. They require corpses. Apparitions and Shadows, you'll get less of, only one Shadow with the Tribune (Level 2 unholy).

You should be getting free spirits as well, including ghosts and shades and other interesting things. More if you have a high dominion, which you really should with any dead Ermor.