Was playing a game with home group and the DM said that the necromancer had to pick his targets for attempting the save because it works like the sleep spell and you have to pick those.
From what I read on sleep, it is one that affects weakest first till everything saves or total HD run out.
I do not know why the DM ruled that way. I was not thinking about looking up the feat or the Sleep spell. It seems to me the DM might have had Sleep confused with another version's Sleep?
Still hoping for some help.