The ruined crypt can be accessed through the Cemetery of Matras. It can only be accessed after a specific stage of the Matras Infection Quest. It is the only way to gain access to the Storehouse of Matras,
- The Skull of Saint Seyna can be found on a shelf for the Shaman's Three Skulls Quest.
- in the cavity near the ghoul's coffin, there is a switch to the right. pressing it will lead down a long hallway into the storehouse. The storehouse is filled with many different scrolls, consumables, and a small bit of gold.