Il Mheg 1/2 of two mirrored zones?

[Iscah]

I agree they are likely dead but death isn't to much of a problem if they are using the Ascians trick but with cyrstals of light.

That's what they were using to travel to the Source, and what we collectively use to warp to the aetherial sea where we see Minfilia again, and they depart for the First... but the crystals' power is almost spent - and again, it's implied that by returning to their own world, in which they physically died and then 'escaped' to the Source, they are returning to that reality where they have died and will complete the natural process of returning to the Lifestream.