City Guard, Iron-cap Crossbowman

Covering Fire. Crossbowman gain +3 to hit any creature if they are within 10-ft of an ally. 

Focus Volley. If at least 3 Iron-cap Crossbowman are within 10 of each other, they may sacrifice their turns in order to focus fire on a 10-ft radius of a point they choose. Each guard may attack any creature within the zone. Additionally they may attack any creature that enter, or that start their turn in, the zone. At the end of every round they may choose to change the point of their focused fire.

Iron-cap Formations. City Guards automatically move adjacent to each other if an ally in formation becomes incapacitated, up until the guards reach a formation's minimum requirement. If any spell, attack, or condition would cause the formation to break, all non-incapacitated City Guards gain their turns back in the next round. 

Crossbow, Heavy. Ranged Weapon Attack: +4 to hit, range 100/400-ft., one target, Hit: 7 (1d10 +2) piercing damage.