Adeptness

You touch a willing creature, simultaneously sprinkling the gem dust from your hand over the target's person. The target's proficiency bonus increases by +1 for the duration.

Only one creature can receive this benefit from you at any given time. If you cast the spell on a different creature, the effect ends for any other creature you cast it on.

Likewise, a creature can only gain this benefit from one source at any given time. If the spell is cast again on the same creature from a different source, the previous casting ends early.

When you cast this spell using a spell slot of 6th level or higher, the bonus increases to +2. When you use a spell slot of 9th level, the bonus increases to +3.