Divine Arrow

You fire an angelic arrow from a bow made of light that
materializes in your hands. Make a ranged spell attack
against a creature within range. On a hit, the target takes
4d10 force damage, and until the spell ends, it becomes
vulnerable to one of the following damage types of your
choice: acid, cold, fire, lightning, necrotic, radiant, or thunder.
If a creature has immunity to the selected damage type,
it instead has resistance to that type for the duration; if a
creature has resistance to the selected damage type, it loses
that resistance for the duration.