Quote Originally Posted by ZorkD View Post
Hi i'd like to know how, what appeared to be emet'selch, showed up and helped the MC against elidibus.

I'm asking this as my understanding of emet'selch, is that he is a tempered subject of zodiark and as such shouldn't be able work against the rejoining.
Technically, this happens after Emet is dead. We are essentially helped by the ghost produced by his lingering aether (as all other ghosts in the game are explained to be). The tempering most likely doesn't hold once they become aether and join the lifestream.