I just think it's more of a melee 2nd skills then ranged, to mention mage.
It has lots of close range auras and such... so you have to be melee to use it correctly without risking your neck.
but lets say, I give up Spirit I lose both the Liche King and the Outsider (later on).
and Earth, I can't replace since I'm powerless with out it
that being said, I think the new Nightmare will be very useful if it was possible for me to add the Dream as a 3rd Mastery.
It may go well with Nature as well...
any thoughts?