# Dragon, Prismatic Ancient

*Gargantuan* *Dragon* *neutral*

- **Armor Class:** 20 (natural armor)
- **Hit Points:** 407 (22d20+176)
- **Speed:** walk 50 ft. climb 40 ft.
- **Challenge Rating:** 21 (33,000 XP)
- **Source:** [Tome of Beasts 3](https://koboldpress.com/kpstore/product/tome-of-beasts-3-for-5th-edition/) page 140

| STR | DEX | CON | INT | WIS | CHA |
| --- | --- | --- | --- | --- | --- |
| 25 (+7) | 10 (+0) | 27 (+8) | 20 (+5) | 17 (+3) | 19 (+4) |

- **Saving Throws**: Dex +7, Con +1, Wis +1, Cha +1
- **Skills:** perception +3
- **Damage Immunities:** radiant
- **Condition Immunities:** blinded
- **Senses:** blindsight 60', darkvision 120', passive Perception 27
- **Languages:** Common, Draconic

### Special Abilities

- **Legendary Resistance (3/Day):** Choose to succeed failed save.

### Actions

- **Multiattack:** Uses Frightful Presence then one Bite and two Claws.
- **Bite:** Melee Weapon Attack: +14 to hit, 15 ft., one target, 18 (2d10+7) piercing damage.
- **Claw:** Melee Weapon Attack: +14 to hit, 10 ft., one target, 14 (2d6+7) slashing damage.
- **Tail:** Melee Weapon Attack: +14 to hit, 20 ft., one target, 16 (2d8+7) bludgeoning damage.
- **Frightful Presence:** All it picks within 120' and aware of it frightened 1 min (DC 19 Wis negates) Can re-save at end of each of its turns. Save/effect ends: immune 24 hrs.
- **Breath Weapon (Recharge 5-6):** Uses one of the following:Light Beam. Emits beam of white light in a 120' line that is 10 ft. wide. Each creature in line: 90 (20d8) radiant (DC 23 Dex half).Rainbow Blast. Emits multicolored light in 90' cone. Each creature in area: 72 (16d8) damage (DC 23 Dex half). Dragon splits damage among acid cold fire lightning or poison choosing a number of d8s for each type totaling 16d8. Must choose at least two types.
- **Spellcasting:** Int (DC 20) no material components: At will: charm person dancing lights prismatic spray1/day: prismatic wall



### Legendary Actions

- **Detect:** Makes a Wis (Perception) check.
- **Tail Attack:** Makes a tail attack.
- **Cast a Spell (2):** Uses Spellcasting.
- **Shimmering Wings (2):** Each creature within 20': DC 19 Wis save or take 16 (3d10) radiant and blinded until start of its next turn.
