A XP lamp (tier 8) is an item obtained during the Broken Home quest. It is the eighth lamp obtained in the quest, located in a chest found below the basement. Follow the path after the room with the Receptionist's desk (north or east door). In the second room with cells (where the Dagger key is), the chest is in the north-eastern cell. It cannot be obtained on the first playthrough, and requires at least level 80 in each skill. Unlike other items, it can be taken out of the mansion. However, it cannot be banked. Rubbing it gives 64,000 XP in a skill of your choice.
Quest experience lamps