Morvayn Ancestral Tomb is the burial chamber for members of the Morvayn family in Raven Rock. Inside there are a couple of benches and nine urns with Ash Yams inside.
This building can also be used to access the Temple Ancestral Tomb via eastern door. The door does require a key, the Raven Rock Temple Key, though.
There is a total of four unmarked circular burial pits here.