2024 rules reference for Staff of Striking.
Staff
This staff can be wielded as a magic Quarterstaff that grants a +3 bonus to attack rolls and damage rolls made with it.
The staff has 10 charges. When you hit with a melee attack using it, you can expend up to 3charges. For each charge you expend, the target takes an extra 1d6 Force damage.
Regaining Charges. The staff regains 1d6 + 4 expended charges daily at dawn. If you expend the last charge, roll 1d20. On a 1, the staff becomes a nonmagical Quarterstaff.