Yin yang Reversal

Level: 5th | School: Transmutation

Casting Time: 1 action

Range: 30 feet

Components: V, S, M (a black-and-white marble)

Duration: Concentration, up to 1 minute

Description: You manipulate the spiritual balance of a target creature. Choose one resistance or immunity it possesses; it is instead treated as a vulnerability for the duration, while another of its resistances (chosen by the caster) becomes immunity. The target may make a Constitution saving throw at the end of each of its turns to end the effect.