Olympus : The sacrifice

"The sacrifice is complete, let the Gods return!" said Celine.
"That's not happening, I can't let you merge the realities." said the man in a black coat.
"And who's gonna stop me?" said Celine.
The man swung his huge sword in the air and said "me,"
"Bring it on," said Celine as she conjured up a fireball.....

Who will win the race to stop the end of the world?
Will the old gods get their way or are there others factors at play?