Quote Originally Posted by zliplus View Post
I've tried this before, and it just gives them MORE room to summon - since it opens space back in the main vault room for the other liches still there. Then more liches and summons leak out and hit the many corridors around as well.
True, but it's way more manageable this way, you can at least beat past the current summons to send an arrow into the bastard lich's skull. Try doing this while invisible, you'll probably notice it's much easier to deal with the summons.