This is a cave just north of Demine, about 1/4 mile. It would not be special normally, but seems to contain a one way portal. This portal is responsible for bringing “Six”, Quinn Marcus Antar, “Brill”, and “Allen” to Baladras (in that order, though “Six” and Quinn arrived together).
Neemus studied the portal, and said wherever the other side is it’s a place he’s never been. This means the other side is a very obscure place.