Susceptibility Infusion

4th-level transmutation
Casting time: 1 bonus action
Range: Self
Target: --
Components: S
Duration: Concentration, up to 1 minute
Classes: Accursed
Subclasses: Sorcerer (Cursed Existence

You infuse your next attack with a curse that creates weakness where there is normally durability in its victim. The next time you hit a creature with an attack during this spell’s duration, your attack deals an extra 4d6 force damage to the target, and the target must succeed on a Constitution saving throw or become cursed for the duration of the spell. Choose a damage type. If the cursed target has resistance or immunity to the chosen damage type, it loses that resistance or immunity. As an action, the target can repeat the Constitution saving throw, ending the spell on a successful save.

A Remove Curse spell ends this effect.