Tome of Peritia

The Tome of Peritia allows you to safely store your experience.

Sneak-right-clicking with the Tome in hand stores one level of XP. right-clicking retrieves a level.

Hold right-click to store/retrieve multiple levels.

If you have the Curios API installed, you can equip the Tome as a charm. If you want to wear more curios at once, consider using a Sigil of Holding, or the Socketed Upgrade for your Living Armour.