Pack Tactics.

The Returned has advantage on an attack roll against a creature if at least one of the Returned's allies is within 5 feet of the creature and the ally isn't incapacitated.

Turn Resistance.

The Returned has advantage on saving throws against any effect that turns undead.

Unreadable Face.

The Returned is immune to any effect that would sense its emotions or read its thoughts. Wisdom (Insight) checks to ascertain the Returned's intentions or sincerity are made with disadvantage.

Actions

Spear.

Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 6 (1d6 + 3) piercing damage, or 7 (1d8 + 3) piercing damage if used with two hands to make a melee attack, plus 7 (2d6) poison damage.

Sling.

Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.

Returned Sentry