True Aim

You focus the aim of up to three creatures of your choice within range. Whenever a target makes an attack roll before the spell ends, they land a critical hit when they roll a 19 or 20, and any weapon damage they deal, including on non-critical hits, is considered magical. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you can target one additional creature for each slot level above 1st.