Twilight Robbery

You touch a creature and force it to make a Charisma saving throw. If it fails, you steal one of the creature's skills, tool proficiencies, or languages for the duration. While this spell is in effect, you use your own proficiency bonus and attribute modifier. If the target had an ability that allowed it to increase its bonus, such as Expertise, or is a member of a Dragonmarked house and gets an additional 1d4 to its roll, you also gain the same ability.

While this spell is in effect, the target can't use its proficiency modifier when using this skill, and makes all rolls for it at disadvantage. If you choose to steal a language from the target, the target loses the ability to read, speak or write the language for the duration.