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Leechroot Colossus

Huge Monstrosity (shapechanger), Neutral Evil


Armor Class 17 (natural armor)

Hit Points 147 (14d12+56)

Speed 20 ft. swim 20 ft.

STR 22 (+6)
DEX 12 (+1)
CON 18 (+4)
INT 6 (-2)
WIS 14 (+2)
CHA 6 (-2)

Saving Throws Con +8, Wis +6

Skills Stealth +6, Perception +4

Senses darkvision 60 ft., passive Perception 14

Languages โ€”

Challenge 10 (5,900 XP) Proficiency Bonus +4


Tree Camouflage. The Leechroot Colossus blends in with fallen timber, appearing as a massive log. In forest terrain, it has advantage on Stealth checks to hide and can use a bonus action to bend its form into a nearby log, maintaining camouflage.
Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.

Actions

Multiattack. The Leechroot Colossus makes two Bite attacks and one Tail attack.
Bite. Melee weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 19 (2d12+6) piercing damage. The creature clamps onto a target, draining sap and blood.
Tail. Melee weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 13 (2d8+4) bludgeoning damage. If the target is Medium or smaller, it must succeed on a DC 16 Strength saving throw or be knocked prone.

Legendary Actions

The creature can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The creature regains spent legendary actions at the start of its turn.

Detect. The creature makes a Wisdom (Perception) check.
Root Collapse. The Leechroot slams the ground within 5 feet of itself. Each creature within 10 feet must succeed on a DC 18 Dexterity saving throw or take 13 (2d6+6) bludgeoning damage and be knocked prone.
Root Sweep (Costs 2 Actions). The Leechroot makes one Tail attack against a target within 15 feet.

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Lore & Description

Appearance

The Leechroot Colossus is a colossal leech that has a chilling way of disguising itself as a fallen log. Its body is a thick, moss-kissed cylinder of dark brown and green, with bark-like plates and rings of suction along its sides. When still, it resembles a dead, weathered log perfect for crossing a forest path. A maw lurks at one end, ringed teeth hidden beneath a slick, sap-glossed lip, ready to latch onto any warm-blooded creature that passes. If disturbed, the bark-like armor ripples and parts, revealing a glistening, rubbery mass within that can lunge forward with surprising speed. It uses its camouflage to ambush prey, feeding on life sap and sometimes scattering spores that help nourish the forest floor.

Behavior & Origins

Long before ferried travelers and towns learned to fight forests, the Leechroot Colossus haunted fallen timber, feeding on sap and vitality. It spends decades buried in a log, perfecting its mimicry so that even the keen-eyed can mistake it for a simple obstacle in the woods. When prey nears, it reveals a brutal maw and a mass of sinewy tongues, draining life with every bite. As a predator attuned to the forest's cycles, it moves with the seasons, shedding its bark-like exterior to reveal its true, writhing form and resuming its patient wait for the next traveler to unwittingly step into its trap.

Monster Image

Leechroot Colossus

Generation Info

Original prompt:
"A massive leech that mimics a fallen tree."

Created: Feb 2, 2026
Modified: May 22, 2026

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