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Boomer

Medium · Plant · CR 1/2 · Unaligned

Source. Tome of Beasts 2

7 (natural armor)

22 (4d8+4)

1/2

Ability Scores

Core attributes and their modifiers.

STR

-5

DEX

-5

CON

INT

-5

WIS

-4

CHA

-5

Overview

Category Monsters

Size Medium

Type Plant

Alignment Unaligned

XP 100

Initiative Bonus -5

Senses

Blindsight 30 ft (9.1 m)

Passive Perception 6

Resistances & Immunities

Damage Immunities

thunder

Condition Immunities

blinded, deafened, frightened

Traits

Deafening Boom

When a creature hits the boomer with a melee attack, the boomer releases a blast of sound. Each creature within 10 feet of the boomer that can hear it must make a DC 12 Constitution saving throw. On a failure, a creature takes 5 (2d4) thunder damage and is incapacitated until the end of its next turn. On a success, a creature takes half the damage and isn’t incapacitated.

Death Burst

When it dies, the boomer explodes in a cacophonous burst. Each creature within 30 feet of the boomer that can hear it must make a DC 12 Constitution saving throw. On a failure, a creature takes 7 (2d6) thunder damage and is deafened for 1 minute. On a success, a creature takes half the damage and isn’t deafened.

False Appearance

While the boomer remains motionless, it is indistinguishable from an ordinary fungus.

Reactions

Shriek

If bright light or a creature is within 30 feet of the boomer, it emits a shriek audible within 300 feet of it. The boomer continues to shriek until the disturbance moves out of range and for 1d4 of the boomer's turns afterward.

About Boomer

Boomer is a medium plant with a Challenge Rating of 1/2. It has a unaligned alignment.

In combat, this creature maintains an Armor Class of 7 and possesses 22 hit points (derived from 4d8+4).

GM Tips: Using Boomer

2 tips available

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

Minion Strategy: Use as scouts or minions for larger threats
Group Tactics: Group 3-4 together to pose a moderate threat

Player Guide: Facing Boomer

2 strategies available

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

Easy Target: This creature is weak - focus on other threats
Group Threat: Multiple can be dangerous - use area attacks

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 1.

Solo Encounter:

A single character of level 2 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 75 XP
Hard: 112 XP
Deadly: 150 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 Boomer?: Boomer has a Challenge Rating of 1/2, making it appropriate for parties of level 0.5.
What type of creature is Boomer?: Boomer is a Medium Plant, which affects how certain spells and abilities interact with it.