Skeletal Archers
HP 3 (1d8-1), AC 11 (13 with shield), Speed 15 ft.
STR 10 (+0), DEX 10 (+1), CON 8 (-1), INT 6 (-2), WIS 10 (+0), CHA 6 (-2)
Vulnerabilities bludgeoning, force, radiant, and thunder damage
Immunities poison and psychic damage
Gear: 1 shortbow, 30 arrows, 1 shield
Traits:
Minion. If the skeleton is killed by a melee weapon attack, its attacker can use their bonus action or reaction to make the same attack against a new target. (The attacker must make a new attack roll.) If the skeleton is killed by a ranged attack, its attacker can instead use their bonus action or reaction to take the Hide, Dodge, or Disengage action and move up to half their speed.
Actions:
Shortbow. +2 to hit (made with disadvantage if any enemy is within 5 ft.), range 80/320 ft., one target. Hit: 3 (1d6) piercing damage. If the target is Medium or smaller, the skeleton can reduce the damage to 2 (1d4) piercing damage in order to force the target to drop an object it's holding.
Shortsword. +2 to hit, reach 5 ft., one target. Hit: 3 (1d6) piercing damage.
Volley. DEX DC 10, range 60 ft., one five-foot square. Failure: 3 (1d4) piercing damage.