Ankylosaurus Zombie

Huge Undead, Unaligned

STR
19 (+4)
DEX
9 (-1)
CON
15 (+2)
INT
2 (-4)
WIS
6 (-2)
CHA
3 (-4)
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

Tail.

Melee Weapon Attack: +6 to hit, reach 10 ft., one target Hit: 18 (4d6 + 4) bludgeoning damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

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Ankylosaurus Zombie

Source: Tomb of Annihilation, p. 240 - Licenses and attribution