Resilience: The zombie has advantage on saving throws against being frightened.spells, and illusions, as well as to resist being charmed or paralyzed.

Sunlight Sensitivity. While in sunlight, the zombie has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Multiattack. The knight makes two melee attacks.

Warhammer. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:  7 (1d8 + 3) bludgeoning damage or 9 (1d10+3) if used with two hands.

Heavy Crossbow. Ranged Weapon Attack: +2 to hit, range 100/400 ft., one target. Hit: 5 (1d10) piercing damage.