Dungeon Master's Guide
Staff Rare (this item requires attunement)
Requires Attunement by a Bard, Cleric, Druid, Sorcerer, Warlock, or Wizard. While holding this staff, you can use an action to expend 1 of its 10 Charges to cast Charm Person, Command, or Comprehend Languages from it using your spell save DC. The staff can also be used as a magic Quarterstaff. If you are holding the staff and fail a saving throw against an Enchantment spell that Targets only you, you can turn your failed save into a successful one. You can't use this property of the staff again until the next dawn. If you succeed on a save against an Enchantment spell that Targets only you, with or without the staff's intervention, you can use your Reaction to expend 1 charge from the staff and turn the spell back on its caster as if you had cast the spell. The staff regains 1d8 + 2 expended Charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the staff becomes a nonmagical Quarterstaff.