Tomb of Illannor

Stone steps descend into an underground crypt in a forgotten cemetery in Sigil. Ancient elvish runes and scenes are carved into the walls. At the opposite end of the square room, a large crescent moon is carved into the wall. There are three large circles carved in various positions on the floor of the room. An inscription is cut deep into the floor at the entrance to the room. It says:"Here lies Illannor, moon priest of the city of Llanthinil""If ye desire to see his beloved city, follow in his steps."  Illannor beheld that the moon loomed larger over each of his steps. "So he stood, water draining from his cupped and opening hands""And then he looked back and saw his shadow darkening the past under the moon's full face.""So he walked on, and the sideways smile spread across his face."As soon as anyone enters the room, the moon on the far wall begins to glow and proceed through its phases. Anyone inside the room takes 4 radiant damage each round the are not following the path of Illannor.