Magic from the Circle of Mages mixed with a more Tevinter style of necromancy mixed with a little bit of blood magic here and there. Strange's spells and symbols are very much a kitchen sink approach to magic. Why not throw everything at the problem and see what sticks? It's good work but some spells are obviously not thought through, cobbled together without fear of any consequences.

"It depends on which aspect of the magic you're talking about," Strange adds in, with a wry little smirk. "My training is with the Circle, though I've added in various styles and tricks from other disciplines--mostly Teventer necromancy, for obvious reasons."

Obvious reasons being the corpse in the middle of the room. Strange still leans against the wall, clutching his chest slightly as he watches Solas examine his work and tries to catch his breath again.