Ash Zombie

Medium Undead, Neutral Evil

STR
13 (+1)
DEX
6 (-2)
CON
16 (+3)
INT
3 (-4)
WIS
6 (-2)
CHA
5 (-3)
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.

Ash Cloud.

When the zombie dies, it leaves a cloud of ash that lasts for 5 minutes but does not obscure vision.

Actions

Slam.

Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

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Ash Zombie

Source: Phandelver and Below: The Shattered Obelisk, p. 52 - Licenses and attribution