Draelamyn's Drenching Deluge

Choose a target creature within range. This spell conjures a miniature rain cloud that hovers over the target's head and follows them wherever they go. The target must succeed on a Charisma saving throw or be soaked by the magical downpour. Affected targets gain resistance to fire damage, vulnerability to lightning damage, and must make saving throws at disadvantage for the duration of the spell.

As a bonus action, the caster may select a new target within range, ending the spell's effects on the previous target.