A hidden dungeon accessed by heading directly east from Rigel Falls.

Like in Gaiden, you can find a lot of Entombed here, although they will be mixed in with boring Revenants and the occasional Specters.

As usual, Entombed will try to run when spotted, which combined with the big open cavern can make them difficult to chase. If possible, try to sneak up from behind and/or approach them while facing a corner so they get stuck.