Pack Tactics. The shadow-touched zombie agglomeration has advantage on an attack roll against a creature if at least one of the shadow-touched zombie agglomeration's allies is within 5 feet of the creature and the ally isn't incapacitated.

Shadow Touch. If a creature is damaged by the shadow-touched zombie agglomeration it must succeed on a DC 13 Constitution saving throw. On failure, the creature receives only half the amount of healing from the next healing it receives before a short or long rest.

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

Undead Fortitude. If damage reduces the shadow-touched zombie agglomeration 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 shadow-touched zombie agglomeration drops to 1 hit point instead.

Multiattack. The zombie agglomeration makes two attacks. These can be any combination of bite, claw, gore, peck, or tail slam but only one of each.

Badger, Bear, Crocodile, Giant Snake, Giant Rat, Hyena, Lion, Mastiff, or Wolf Head.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage.

Badger, Bear, Crab, Giant Rat, Hyena, Lion, Mastiff, Giant Owl, Scorpion, or Wolf Arms.
Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 +3) slashing damage.

Auroch, Boar, Bull, Deer, Elk, Goat, or Rhino Head.
Gore. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8+3) piercing damage. If the shadow-touched zombie agglomeration moves at least 20 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 9 (2d8) bludgeoning damage. If the target is a creature it must succeed on a DC 13 Strength saving throw or be knocked prone.

Axe Beak, Eagle, Owl, Raven, Turtle, or Vulture Head.
Peck. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) piercing damage. 

Crocodile, Giant Lizard, or Giant Snake.
Tail Slam. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 9 (1d10 + 3)