Staff of Withering

This staff has 3 charges and regains 1d2
expended charges daily.
The staff can be wielded as a magic quarterstaff.
On a hit, it deals damage as a normal quarterstaff,
and you can expend 1 charge to deal an extra
2d10 necrotic damage to the target. In addition,
the target must succeed on a DC 15 Constitution
saving throw or have disadvantage for 1 hour on
any ability check or saving throw that uses
Strength or Constitution.