what I don't understand is why necros do little damage with this spell? Even with max crit AA's and demiplane focus (60%) the most you will ever get out of this is a 6-7k crit. Keep in mind that I regularly see paladins slay undead for 20k or so. Sure, this nuke is cheap on mana, but the long casting time makes this spell almost pointless.
In my opinion, we should get a 7k base nuke vs. undead, or at least reduce the casting time to 1-2 sec on the existing spell. Either that or give us a wicked undead DOT like dreadpyre for undead only. Afterall, we are supposed to be the "masters of undead".