Guard 2014

Melee or Ranged Weapon Attack: +3 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d6+1) piercing damage, or 5 (1d8+1) piercing damage if used with two hands to make a melee attack.

When a friendly creature the guard can see within 5 feet of it is the target of an attack, the guard can interpose its weapon between the creature and the attacker. The friendly creature adds 2 to its AC against that attack. To use this reaction, the guard must be able to see the attacker and be wielding a melee weapon.