aim

When you cast this spell, you increase your ability to concentrate on a spell you have already cast. You can cast this spell while maintaining concentration on another spell. Aim gives you a +10 bonus on Concentration checks you make to maintain concentration on the other spell and you have advantage on all ranged attacks made with crossbows while you maintain concentration on the other spell. The effect of this spell lasts 10 minutes or ends when you lose concentration on the other spell (whichever comes first).