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Ooze, Sinkhole

Gargantuan · Ooze · CR 4 · Unaligned

Source. Tome of Beasts 3

108 (8d20+24)

Ability Scores

Core attributes and their modifiers.

STR

DEX

-3

CON

INT

-4

WIS

-2

CHA

-5

Overview

Category Monsters

Size Gargantuan

Type Ooze

Alignment Unaligned

XP 1100

Initiative Bonus -3

Movement

Walk 20 ft (6.1 m)

Swim 10 ft (3 m)

Climb 20 ft (6.1 m)

Burrow 40 ft (12.2 m)

Crawl 10 ft (3 m)

Senses

Blindsight 120 ft (36.6 m)

Passive Perception 8

Saving Throws

Strength +6

Skills

Perception -2

Resistances & Immunities

Damage Immunities

acid

Condition Immunities

blinded, charmed, deafened, exhausted, frightened, prone

Traits

Amorphous

Move through space 1ft.+ wide with o squeezing.

Hollow Cylindrical Form (Stretched Body Only)

Creatures can occupy space in center of cylinder formed by the ooze and each such space is always within ooze’s reach regardless of cylinder's size.

Ooze Nature

The sinkhole ooze doesn’t require sleep.

Seizing Pseudopods

Can have up to 6 tendril-like Pseudopods at a time. Each can be attacked (AC 10; 10 hp; immunity to acid poison and psychic). Destroying Pseudopod deals no damage to ooze which can extrude a replacement on its next turn. Pseudopod can also be broken if creature takes an action and makes DC 14 Str check.

Slimy Appearance (Stretched Body Only)

While it remains motionless is indistinguishable from interior of the pit or hole in the ground it is stretched across though interior walls appear wet.

Spider Climb

Difficult surfaces even ceilings no ability check.

Bonus Actions

Stretch Body

Stretches body around inner walls of a pit sinkhole or other circular opening in the ground. Stretched this way it forms a hollow cylinder up to 25 ft. tall up to 25 ft. radius. Ooze can end stretch as a bonus action occupying nearest unoccupied space to the hole.

Reactions

Pluck

When 1+ creature falls down center of its cylinder can try to grab up to 2 of them. Each must make DC 14 Dex save or grappled (escape DC 14) in Pseudopod.

About Ooze, Sinkhole

Ooze, Sinkhole is a gargantuan ooze with a Challenge Rating of 4. It has a unaligned alignment.

In combat, this creature maintains an Armor Class of 7 and possesses 108 hit points (derived from 8d20+24).

GM Tips: Using Ooze, Sinkhole

3 tips available

When using Ooze, Sinkhole in your D&D 5e campaign, consider these tactical approaches:

Burrowing Tactics: This creature can burrow at 40 ft. It can ambush from underground or escape combat by digging. Use 'Earthbind' or create difficult terrain to limit burrowing. Consider fighting in areas without soft ground.
Climbing Advantage: This creature can climb at 20 ft. It can use walls and ceilings for tactical positioning. Consider using 'Spider Climb' negation or fighting in open areas without vertical surfaces.
Amorphous Movement: This creature can squeeze through spaces as small as 1 inch! Traditional barriers are ineffective. Use 'Wall of Force', 'Forcecage', or magical barriers to contain it.

Player Guide: Facing Ooze, Sinkhole

3 strategies available

When your party encounters this creature, keep these strategies in mind:

Burrowing Defense: This creature can burrow at 40 ft! It can ambush from underground. Use 'Earthbind', create difficult terrain, or fight on hard surfaces. 'Stone Shape' can seal burrows.
Climbing Defense: This creature can climb at 20 ft! It can use walls and ceilings for surprise attacks. Fight in open areas without vertical surfaces. 'Spider Climb' negation spells can help.
Contain Amorphous Creature: This creature can squeeze through tiny spaces! Traditional barriers won't work. Use 'Wall of Force', 'Forcecage', or magical barriers. 'Create Bonfire' can block movement.

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 4.

Solo Encounter:

A single character of level 6 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 2,000 XP
Hard: 3,000 XP
Deadly: 4,000 XP

Based on D&D 5e Dungeon Master's Guide encounter building guidelines. CR roughly equals party level for medium encounters.

Frequently Asked Questions

What is the challenge rating of Ooze, Sinkhole?: Ooze, Sinkhole has a Challenge Rating of 4, making it appropriate for parties of level 4.0.
What type of creature is Ooze, Sinkhole?: Ooze, Sinkhole is a Gargantuan Ooze, which affects how certain spells and abilities interact with it.