Aptitude Appropriator

The caster touches one willing creature and they can temporarily acquire the ability to use a nonweapon proficiency known to another creature. The creature touched does not lose its knowledge of the proficiency, the spell merely allows the caster to know the proficiency as well.

Only nonweapon proficiencies can be transferred. These include Skills that a willing creature has Proficiency in (such as Deception or Sleight of Hand) OR Armor proficiency OR Tool proficiency OR Language proficiency.