Staff of Withering
Staff, rare, requires attunement by a cleric, druid, or warlock · 2014 rules, SRD 5.1
3 charges: on a hit spend 1 for an extra 2d10 necrotic and a DC 15 Con save or disadvantage on Str/Con checks and saves for 1 hour.
Also in the 2024 rules (SRD 5.2).