Quote Originally Posted by MrThinker View Post
Remember that Nabriales was already on the Source BEFORE Midgardsormr stripped us of the blessing. It is implied he was the one who taught Ysayle how to summon Shiva, and he is seen after our battle with her observing from a distance.
Judging by what he says, it is possible that Lahabrea gave him a way to come to The Source. In the first cutscene with Moenbryda in Northern Thanalan he says, "I suffered the overweening presence of Lahabrea that men might host the power of gods, only for you to undo my hard work."

It's quite possible, similar to how Elidibus gives Ardbert and co. a method to move from a Shard to the Source that the same is done for Shard based Ascians. Though, honestly, it's all a mess. I still don't know if they're ever gonna mention why Ascians no longer use Crystals of Darkness for body possession and the like.

My assumption is that when we beat Nabriales he restates that he may return everyday, for as long as it takes now that the Blessing is undone. He's also shown to immediately return from the rift in that same cutscene. To reconstitute a body without taking a physical host, even. While it is set within the Rising Stones, why would the building itself reject Ascians because we have The Blessing? By that logic, any building we've been in would be sealed to them, and that is incredibly silly.