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Book of Regression is an item that can be used to reduce the player character's level by one. It cannot be traded or placed in the stash. The character must have at least one unallocated passive skill point in order to use a Book of Regression.[1]
Added a vendor recipe item - Book of Regression. This will reduce the level of your current character by one. Like other books, this is not tradeable. This item is obtained by the vendor recipe of an Orb of Scouring and a Scroll of Wisdom. Use this item with care - losing a level may disable items you have equipped. You must have an unallocated Passive Skill Point to use this item.
References
↑Qarl (April 20, 2016). "2.2.2b Patch Notes". Official Path of Exile Forums. Retrieved April 20, 2016.
