Create Thunderstaff
After 60 days, the staff is fully charged and can’t absorb any more sound. At that point, it becomes a **thunderstaff**, a +1 quarterstaff that has 10 charges. When you hit on a melee attack with the staff and expend 1 charge, the target takes an extra 1d8 thunder damage. You can cast a [thunderwave](https://api.open5e.com/spells/thunderwave) spell from the staff as a bonus action by expending 2 charges. The staff cannot be recharged.
If the final charge is not expended within 60 days, the staff becomes nonmagical again.