Sources
CR
Type
Size
Alignment
Movement

Greater Zombie

Medium Undead, Neutral Evil

Armor Class 15 (natural armor)
Hit Points 97 (13d8 + 39)
Speed 30 ft.
STR
18
+4
DEX
10
+0
CON
17
+3
INT
4
-3
WIS
6
-2
CHA
6
-2
Saving Throws WIS +1
Damage Resistances cold, necrotic
Damage Immunities poison
Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Poisoned
Senses darkvision 60 ft., passive Perception 8
Languages understands the languages it knew in life but can't speak
Challenge 5 (1,800 XP)

Traits

Turn Resistance. The zombie has advantage on saving throws against any effect that turns undead.

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.

Actions

Multiattack. The zombie makes two melee attacks.

Empowered Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:7 (1d6 + 4) bludgeoning damage and 7 (2d6) necrotic damage.

Lore

Many of those who brave the Tomb of Horrors believe they have reached their ultimate destination when they disturb a skeletal figure inside a secluded crypt. It is, in fact, a greater zombie, a creature magically created from a humanoid corpse to be far more resilient than a typical zombie.