I can only cast Ice burst but i find the best place for Exp is Pc, You run up to the portals and ancient the monsters around the portal. I love ancienting around the purple Portal as near the end of the game(If its still there) usally has Lots of Npc's begging to get iced. One of the times i was watching, i Got 60 damege points with one cast of Ice burst beside portal, so thats a heck of exp per hour, Specailly with Barrage. downside is you burn money fast hope that helps