Tips, tricks & notes:

•Players with 300+ Quest Points can obtain a Helmet of Trials from Xenia after the quest.
•Speak to Xenia at any point during or after the quest to retrieve Kayle's bow, Caitlin's staff, and/or Reese's sword should you lose them.
•Following completion of the quest, another level of the Lumbridge Catacombs (beneath the chamber where Reese was fought) is unlocked. This area is swarming with undead creatures, and the pieces of the Mask of Dragith Nurn can be obtained by killing them.
•In this same area, several Statuettes can be found guarded by the undead monsters. These can be looted and sold to Xenia for a small amount of coins each.
•After the quest a shortcut through the Lumbridge Catacombs is unlocked. After entering the Catacombs, go down the stairs on your left. You'll arrive right next to the entrance to the lower level of the Catacombs.