Vial of the Black Moon

Requires attunement
Gain resistance to radiant dmg. Once per short
rest, open the vial as a bonus. This ends your
resistance to radiant dmg until you complete a
short rest. Add one of the following to the next
successful weapon or spell atk before the
end of your next turn:
•An additional 1d8 necrotic dmg from the attack.
•Lose resistance to radiant or necrotic dmg
until the end of its next turn.