A XP lamp (tier 4) is an item obtained during the Broken Home quest. It is the fourth lamp obtained in the quest, located in a chest found in the basement's Wine Cellar, under a table on the south side of the room. It cannot be obtained on the first playthrough, and requires at least level 40 in each skill. Unlike other items, it can be taken out of the mansion. However, it cannot be banked. Rubbing it gives 8,000 XP in a skill of your choice.
Quest experience lamps