Creature Reference Back to Creatures

Dragon, Prismatic Ancient

Gargantuan · Dragon · CR 21 · Neutral

Source. Tome of Beasts 3

20 (natural armor)

407 (22d20+176)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

WIS

CHA

Overview

Category Monsters

Size Gargantuan

Type Dragon

Alignment Neutral

XP 33000

Initiative Bonus +0

Movement

Walk 50 ft (15.2 m)

Swim 25 ft (7.6 m)

Climb 40 ft (12.2 m)

Crawl 25 ft (7.6 m)

Senses

Darkvision 120 ft (36.6 m)

Blindsight 60 ft (18.3 m)

Passive Perception 27

Saving Throws

Dexterity +7 Constitution +1 Wisdom +1 Charisma +1

Skills

Perception +3

Languages

Common, Draconic

Resistances & Immunities

Damage Immunities

radiant

Condition Immunities

blinded

Traits

Legendary Resistance (3/Day)

Choose to succeed failed save.

Legendary Actions

Cast a Spell

Cost 2

Uses Spellcasting.

Detect

Cost 1

Makes a Wis (Perception) check.

Shimmering Wings

Cost 2

Each creature within 20': DC 19 Wis save or take 16 (3d10) radiant and blinded until start of its next turn.

Tail Attack

Cost 1

Makes a tail attack.

About Dragon, Prismatic Ancient

Dragon, Prismatic Ancient is a gargantuan dragon with a Challenge Rating of 21. It has a neutral alignment.

In combat, this creature maintains an Armor Class of 20 and possesses 407 hit points (derived from 22d20+176).

Dragon, Prismatic Ancient has communication capabilities including Common, Draconic. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Dragon, Prismatic Ancient

1 tips available

When using Dragon, Prismatic Ancient in your D&D 5e campaign, consider these tactical approaches:

Climbing Advantage: This creature can climb at 40 ft. It can use walls and ceilings for tactical positioning. Consider using 'Spider Climb' negation or fighting in open areas without vertical surfaces.

Player Guide: Facing Dragon, Prismatic Ancient

1 strategies available

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

Climbing Defense: This creature can climb at 40 ft! It can use walls and ceilings for surprise attacks. Fight in open areas without vertical surfaces. 'Spider Climb' negation spells can help.

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 21.

High-Level Solo Encounter:

This creature is too powerful for a single level-20 character. You need 3.0 character(s) at maximum level (20) to face this creature.

Experience Point Thresholds:

Medium: 46,200 XP
Hard: 69,300 XP
Deadly: 92,400 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 Dragon, Prismatic Ancient?: Dragon, Prismatic Ancient has a Challenge Rating of 21, making it appropriate for parties of level 21.0.
What type of creature is Dragon, Prismatic Ancient?: Dragon, Prismatic Ancient is a Gargantuan Dragon, which affects how certain spells and abilities interact with it.
What languages does Dragon, Prismatic Ancient speak?: Dragon, Prismatic Ancient can communicate in Common, Draconic.