Template:CalledShot

Just before making an attack roll with a weapon or an unarmed strike, you can make a target strike either by expending 2 stamina points, or by taking disadvantage on the attack roll. You cannot make a target strike if the attack roll would have disadvantage anyway, and cannot make a target strike as part of a bonus action unless a feature states otherwise.

A target strike generally aims for wherever the target is most vulnerable, such as gaps in a warrior's armor, or the exposed eye of a huge monster. This kind of target strike maximizes the damage dice rolled on a hit (e.g., treat 1d8 as simply 8), including any extra dice rolled as part of a critical hit or from other sources. Your DM may enable alternate or additional effects for a target strike.