Casting Time: 1 action
Classes: Artificer, Bard, Sorcerer & Wizard
Source: Xanathar’s guide to everything
Components: V, S
Duration: Concentration, up to 1 hour
Your magic deepens a creature’s understanding of its own talent.
You touch one willing creature and give it expertise in one skill of your choice; until the spell ends.
The creature doubles its proficiency bonus for ability checks it makes that use the chosen skill.
You must choose a skill in which the target is proficient and that isn’t a lready benefiting from an effect, such as Expertise, that doubles its proficiency bonus.