Thanatos nods at that assessment. There is no one else it could be that he can perceive! The wail barely registers anything on Thanatos' face other than intrigue, turning his head along with Orpheus to look for the source of the wail.

"'Three is key', it says. So that would make sense..." He touches a finger to his chin thoughtfully, and begins to make his way closer to the door. Even he is a little hesitant, with the door slamming and opening on it's own, but nothing that is in there scares him more than the prospect of him being trapped in this place. "If we are to invite this third... Mmmh." Thanatos has no way of knowing that this thing will possess him! And that Orpheus will need to somehow wrestle him through the door. "Let us not hesitate."