Depends on what incarnation of Sise Neg.
Remember, the reason Sise-Neg was so powerful was that he travelled back in time from the future back across the ages absorbing ambient magical power as he went.
By the time he had reached the creation point he had amassed basically all the magical power there was in reality so by releasing it, he re-triggerred the creation event.
If the team are against Sise Neg before he went on this trip, then i give it to the team.
If its after the trip, then i give it to Sise Neg. Not many can stand against the amassed mystical might of an entire universe.
