Creature Reference Back to Creatures

Copperkill Slime

Huge · Ooze · CR 8 · Unaligned

Source. Tome of Beasts 3

142 (15d12+45)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

-3

WIS

-1

CHA

-4

Overview

Category Monsters

Size Huge

Type Ooze

Alignment Unaligned

XP 3900

Initiative Bonus +0

Movement

Walk 20 ft (6.1 m)

Swim 10 ft (3 m)

Climb 20 ft (6.1 m)

Crawl 10 ft (3 m)

Senses

Blindsight 60 ft (18.3 m)

Passive Perception 9

Skills

Perception -1

Resistances & Immunities

Damage Immunities

acid, poison

Damage Resistances

piercing, slashing

Condition Immunities

blinded, charmed, deafened, exhaustion, frightened, prone

Traits

Amorphous

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

Ooze Nature

Doesn’t require sleep.

Patinated Appearance

While motionless indistinguishable from the object or structure it is stretched across though the object or structure appears to be covered in green paint or verdigris.

Spider Climb

Difficult surfaces even ceilings no ability check.

Bonus Actions

Stretch Body

Stretches its body across surface of a Gargantuan or smaller object or across surface of a wall pillar or similar structure no larger than a 20' square within 5 ft. of it sharing the space of the object or structure. Slime can end the stretch as a bonus action occupying nearest unoccupied space to the object or structure.

About Copperkill Slime

Copperkill Slime is a huge ooze with a Challenge Rating of 8. It has a unaligned alignment.

In combat, this creature maintains an Armor Class of 10 and possesses 142 hit points (derived from 15d12+45).

GM Tips: Using Copperkill Slime

2 tips available

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

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 Copperkill Slime

2 strategies available

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

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 8.

Solo Encounter:

A single character of level 11 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 7,200 XP
Hard: 10,800 XP
Deadly: 14,400 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 Copperkill Slime?: Copperkill Slime has a Challenge Rating of 8, making it appropriate for parties of level 8.0.
What type of creature is Copperkill Slime?: Copperkill Slime is a Huge Ooze, which affects how certain spells and abilities interact with it.