Corpse Guard: Footman

Heavy Armor Master. When the footman is hit by an attack, any Bludgeoning, Piercing, and Slashing damage dealt by that attack is reduced by 3.

Sentinel. The footman gains the following abilities.
Guardian. Immediately after a creature within 10 feet of the footman takes the Disengage action or hits a target other than it with an attack, it can make an Opportunity Attack against that creature.
Halt. When the footman hits a creature with an Opportunity Attack, the creature's speed becomes 0 for the rest of the current turn.

Undead Fortitude. If damage reduces the footman to 0 Hit Points, it makes a Constitution saving throw (DC 5 plus the damage taken) unless the damage is Radiant or from a Critical Hit. On a successful save, the footman drops to 1 Hit Point instead.

Rally (3/day). The footman chooses a number of allies within a 30-foot emanation originating from itself, up to a number of allies equal to its Constitution modifier. Each of those allies gains 1d6+5 temporary Hit Points.

Second Wind (1/day). The footman has a limited well of stamina it can draw on. As a Bonus Action, it can use it to regain Hit Points equal to 1d10+5.