Staff of Withering
Staff,
Rare
(requires attunement; cost 5000 gp)
Crafting Components
Remains of a creature killed by the blight spell
(requires attunement by a cleric, druid, or warlock)
This magic quarterstaff has 3 charges and regains 1d3 expended charges each dawn. When you make a successful melee attack with the staff, you can expend 1 charge to deal an extra 2d10 necrotic damage. The target makes a DC 15 Constitution saving throw or for the next hour it has disadvantage on Strength and Constitution checks and saving throws.
Source