E/A Stone Blaster
Just an idea I came up with mucking around with my low level clone; stick a load of PBAoE Earth Spells, Shadow step in and watch the carnage. I'll probably develop it a little before I'm totally happy.
Energy Storage: 12+1
Earth Magic: 12+1+3
Shadow Arts: 3
Death's charge, Shockwave (e), Earthquake, Aftershock, Crystal wave, Sliver armor, Earth attunement, Resurrection signet