Soulforging, is very much so magic. Except it's not fueled by mana.
For instance, a Shaman could use his or her spirit to 'sync' up to that of a natural spirit, an animal or a plant. 

Like I said, I'm giving you very free reigns. Press the limits I write in the OP, and if I enjoy it and think it's a solid concept, I'll allow it.

Shoot for the stars, so to speak.