You have resistance to poison damage and you can't be petrified while you hold this staff.

The staff has 10 charges. While holding it, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC: stone blast (new) (1 charge), meld into stone (3 charges), stone shape (4 charges), or wall of stone (5 charges).

The staff regains 1d6 + 4 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the staff crumbles into dust and is destroyed.

Notes: Resistance: Poison, Immunity: Petrified, Cleric, Druid, Sorcerer, Warlock, or Wizard, Damage, Control, Combat, Warding