Mace of Disruption
Weapon (mace), rare, requires attunement · 2014 rules, SRD 5.1
Extra 2d6 radiant to fiends and undead; such a target with 25 HP or fewer after the hit makes a DC 15 Wis save or is destroyed. Sheds light.
Also in the 2024 rules (SRD 5.2).