Arcane Infiltration

You attempt to infiltrate the spell of a creature you can see within range and become additionally considered as one of its targets. The chosen spell must require concentration and none of the original targets are replaced.

Make an Intelligence (Arcana) check. The DC is 10 + the spell's level. Upon success, you succeed in your infiltration and gain the effects of the infiltrated spell until it ends, otherwise the infiltration fails and the caster of the chosen spell is notified of your attempt.