I'd like to see a shaman skill based on astrology. And it would involve summoning constellations, zero gravity, supernovas (exploding stars), starry path summons, 'shooting stars' cannon barrage, etc. I'll leave the rest to you guys to think up.

To me, Astrology is pretty similar to the Physicist tree. I count astrology as science. So id probably want something a bit more further away from that tree.