So think of a cleric.

Clerics can be light, dark or nuetral.
Light powers are about healing and sheilding.
Nuetral powers tend to buff or manipulate life.
Dark powers are about pain and taking life away.
It's cleric magic, but not based on alignment.
Allowing for more versatility per say.as a dark cleric doesn't heal, but if you knew both light and dark you could do something like soul tap.

Spawns a slightly controlled magical missle missle that injures a what it hits, but then flies at another target healing them relative to how injured the original target was.
I decided to associate it with stars rather then god though.