I think you can do some low level Gauntlet manipulation with Spirit 2. I'm pretty sure lowering/increasing the difficulty to cross was 2 (from 3/4 to 10, I think, but that may vary between books)

Prime 2/Spirit 2 , if I remember correctly, could be used to do stuff like create weapons that would specifically harm denizens of the other side. Like, you can have an enchanted empty sword handle, that on the other side it's a complete sword that can harm inmaterial spirits.