So, I know the system's not done and the classes may address this, but... there are a lot of necros, especially at higher levels, that target all creatures in a large area, which technically includes you and any of your allies. For instance, Life's Great Peak might just swallow you all up and crush you all into a big, dead minion-ball-of-doom. I would assume that this will be addressed once the classes are written up, but I was curious.
For what it's worth, I'm really intrigued by the long-duration buffs and instantaneous effects, and really want to see how they work in an actual game setting given the 'castings-per-week' mechanic.