Disenchant

Strips enchantments off the items held by the block it is drawn on, such as a pedestal or a chest, one enchantment at a time, and pays the circle's owner for each. If you do not yet know the rune for that kind of enchantment (weapon or armor), you learn it. If you already know it, you get mana instead, and enchantments from other mods always pay a fixed amount of mana. It only works while its owner is online.

Enchanted books work too: the last removal leaves a plain book. It has a single level.