Staff of Withering

[Requires Attunement by Cleric, Druid, Warlock]
This staff has 3 charges and regains 1d3 expended
charges daily at dawn.
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.