It seems likely that it is Dominion to me. The creatures Paalm created with hemalurgy were beings that had twisted skeletal shapings and had extremely hard bones. This seems very similar to the Dakhor monks of sel, which use dominions form of investiture. This coincidence seems very deliberate, and we received no information on the hemalurgic spikes retrieved from the bodies, which may also have been of that new God Metal. WoB left himself a window here, because he could ultimately just call it a reaction of some part of hemalurgy we were just unaware of, but it is a strong coincidence.
