Creature Reference Back to Creatures

Swampgas Bubble

Medium · Ooze · CR 2 · Unaligned

Source. Tome of Beasts 2

59 (7d8+28)

Ability Scores

Core attributes and their modifiers.

STR

DEX

-2

CON

INT

-5

WIS

CHA

-4

Overview

Category Monsters

Size Medium

Type Ooze

Alignment Unaligned

XP 450

Initiative Bonus -2

Movement

Walk 20 ft (6.1 m)

Fly 30 ft (9.1 m)

Swim 10 ft (3 m)

Climb 10 ft (3 m)

Crawl 10 ft (3 m)

Hover Yes

Senses

Blindsight 60 ft (18.3 m)

Passive Perception 10

Resistances & Immunities

Damage Immunities

bludgeoning, poison

Damage Vulnerabilities

fire

Condition Immunities

blinded, charmed, deafened, exhaustion, frightened, poisoned, prone

Traits

Bludgeoning Bounce

Whenever the swampgas bubble is subjected to bludgeoning damage, it takes no damage and instead is pushed up to 10 feet away from the source of the bludgeoning damage. If the bubble is subjected to bludgeoning damage while attached to a creature, the bubble must succeed on a DC 13 Strength saving throw or detach from the creature and be pushed up to 5 feet away.

Fiery Death

If the swampgas bubble has half its hp or fewer and takes any fire damage, it dies explosively. Each creature within 20 feet of the bubble must make a DC 13 Dexterity saving throw, taking 7 (2d6) fire damage on a failed save, or half as much damage on a successful one.

Actions

Pseudopod

+5 to hit, reach 5 ft (1.5 m). Hit: 1d6+3 plus 1d8 poison damage.

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 4 (1d8) poison damage.

Suffocating Grasp

+5 to hit, reach 5 ft (1.5 m). Hit: 1d6+3 poison damage.

Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 3) bludgeoning damage. If the target is Medium or smaller, the swampgas bubble attaches to the target's head, and the target is blinded while the bubble is attached. While attached, the bubble can't make pseudopod attacks against the target. At the start of each of the bubble's turns, the target takes 9 (2d8) poison damage and begins suffocating as it breathes in the poisonous gases within the bubble. A creature is affected even if it holds its breath, but creatures that don't need to breathe aren't affected.

The bubble can detach itself by spending 5 feet of its movement. It does so if its target falls unconscious or dies. A creature, including the target, can take its action to detach the bubble by succeeding on a DC 13 Strength check.

About Swampgas Bubble

Swampgas Bubble is a medium ooze with a Challenge Rating of 2. It has a unaligned alignment.

In combat, this creature maintains an Armor Class of 8 and possesses 59 hit points (derived from 7d8+28).

GM Tips: Using Swampgas Bubble

1 tips available

When using Swampgas Bubble in your D&D 5e campaign, consider these tactical approaches:

Flight Control Strategy: Target flying creatures with spells like 'Hold Person', 'Web', or 'Grease' to ground them. Without flight restriction, they can escape melee range easily. Consider area denial spells below their flight altitude to force them into disadvantageous positions.

Player Guide: Facing Swampgas Bubble

1 strategies available

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

Counter Flight Advantage: This creature can fly! Use ranged attacks, reach weapons, or spells like 'Thunderwave' to push it away. Consider 'Gust of Wind' or 'Earthbind' to ground it. Melee characters need fly speed or flight magic to engage.

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 2.

Solo Encounter:

A single character of level 4 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 600 XP
Hard: 900 XP
Deadly: 1,200 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 Swampgas Bubble?: Swampgas Bubble has a Challenge Rating of 2, making it appropriate for parties of level 2.0.
What type of creature is Swampgas Bubble?: Swampgas Bubble is a Medium Ooze, which affects how certain spells and abilities interact with it.