Beneath the mausoleum in Paterdomus is the Columbarium, a unique place where dead bodies were burnt and placed in containers. Those containers were sealed into the walls of the Columbarium. The chamber is now used to free the tortured souls from Vyre corpses. It can be reached by descending the staircase at the north end of the main room in the mausoleum, where the circle of monuments is (the room to the west of Drezel).
During and after the Legacy of Seergaze quest, the player discovers a way to kill the members of the dreaded Vyrewatch. The player can collect the resulting Vyre corpses and free their souls by cremating the corpses in the funeral pyres at the Columbarium. A Columbarium key appears for each soul that is freed. The keys unlock various coffins in the walls, which contain item rewards. This functions in much the same way as the Shades of Mort'ton activity.
The southern end of the Columbarium contains a lectern which keeps track of how many Vyre corpses the player has burned, up to a maximum of 500. For every 50 Vyre corpses that have been cremated, the power of the player's Ivandis flail and Blisterwood weapons increase. The higher the logs used, the higher the xp returned; higher logs do not increase chances of obtaining higher rewards.