That'd entirely depend on us plucking the eye back out of Nidhogg's head again. He did reassume his full form, after all.
"Ascian of the 12th Chalice," "Ascian of the 12th Sword," "Ascian of the 12th Pentacle," and "Ascian of the 12th Wand." They're the lowest ranked of the Ascians (we've fought members of that rank before) and their ranking convention follows Tarot cards of the Minor Arcana.
If he is indeed still alive within the eye then there are several different ways they could go with the character from here. I imagine we'll be pursuing Nidhogg in an attempt to free Estinien; it would be an interesting twist to have us rescue him only to discover Lahabrea hitched a ride in his body on the way out.
To expand on this, each 'house' of lesser Ascians each follow one of the primary ones. Those of the 12th Chalice are confirmed to follow Lahabrea in the SMN 60 quest. We were also informed that they do not have the ability to retreat to the Ascian HQ between worlds and they cannot possess living hosts (only dead ones) which means killing a lesser Ascian with no corpses around to switch to will actually kill them permanently.
My assumption is that -some- Ascians keep wanting to make the Warrior of Light stronger, more powerful, and essentially more famous, so that when they -do- kill the Warrior of Light off, they will be able to easily convince a LOT of people, in their desperation and despair, to try to restore the Warrior of Light.
In other words, the Ascians want to make the greatest Primal ever out of us. That's my theory.
I really hope Lahabrea doesn't come back.
I found Igeyorhm more interesting, but much how Nero and not Livia came back, you don't usually see a female villain return.