Thalmarkin lost about 10 nobles to the undead I think, 2 kings, 2 generals.
Mortality does provide for much more dynamic politics and that's why I like it but BT simply is the wrong continent to have it. Invasion time is not a time for internal politics. Besides, the loss of an NPC like a daimon leaderreally doesn't weigh up against the loss of a noble. Not to say that there didn't go any thought into the individual daimon NPCs or that their death doesn't hurt the daimons, but they /are/ just temporary characters. Designed to wreak havoc for a while and then disappear again whereas that is not the case with PCs.
Mortality needs to permanently be on a continent with human conflict, where it would really matter to kill the king of an enemy realm.