Putrid Haunt

Swamp Undead. Putrid Haunts are ambulatory corpses preserved by the effects of immersion in swamp peat and are infused with moss, mud and the detritus of the deep swamp. They are shambling remains of individuals who, either through misstep or misdeed, died while roaming in a vast swampland. Their desperate need to escape the marshland in life translates to a hatred of all living things, especially living sentients, in death. They often gather in places tainted by especially evil deeds, and can arise from curse, violence or the actions of necromancy.
Mossy Islands. When no potential victims are nearby, putrid haunts sink into the water and muck, where moss and water plants grow over them and vermin inhabit their rotting flesh. When living creatures draw near, the dormant putrid haunt bursts from its watery hiding spot and attacks its prey, slamming wildly with its arms and stomping on prone foes to push them deeper into the muck. There’s no planning and little cunning in their assault, but they move through the marshes more freely than most intruders and they attack with a single-mindedness that’s easily mistaken for purpose.
Leech Nests. Putrid haunts create especially favorable conditions for leeches. They are often hosts or hiding places for large gatherings of leeches.
Undead Nature. A putrid haunt doesn’t require air, food, drink, or sleep.

Suggested Environments: Swamp, Jungle
Treasure: 1d100 ...on a 20 or lower, 3d4 gold stuck into what remains of the creature's rotten clothing and gear. At DM's choice, 1 trinket may be included in an encounter of 4+ Putrid Haunts.

Putrid Haunt

Medium undead, neutral evil

Armor Class 13

Hit Points Average 44 8d8+8

Speed 30ft

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STR

16 +3

DEX

8 -1

CON

12 +1

INT

6 -2

WIS

10 0

CHA

6 -2

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Saving Throws —

Skills —

Damage Resistances Nonmagical

Damage Immunities Poison

Condition Immunities Poisoned

Senses Darkvision 60’, PP 10

Languages None

Challenge 2

Dead Still. Treat a Putrid Haunt as invisible while it remains buried in swamp muck.
Swamp Shamble. Putrid Haunts suffer no movement penalties in marshy terrain.

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Actions

Slam. Melee Weapon Attack, +5 to hit, reach 5’, one target. Hit: 2d8+3 normal bludgeoning damage.
Vomit Leeches (recharge 6). A Putrid Haunt can vomit forth the contents of its stomach onto a target within 5 feet. Along with the mud and sickly bile, this includes 2d6 undead leeches that attack the target on the start of its (the target’s) turn, and the Putrid Haunt gains the same number of temporary hit points. As an action, a creature can remove or destroy 1d3 leeches from itself or an adjacent ally.

(From the Tome of Beasts 5E)
These shambling corpses have twigs, branches and other debris intertwined with their bodies, and are fairly covered in undead leeches covering their patchy gray flesh. The smell is beyond description, the putridity of meat exposed to air after years of immersion in sewage.