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Dragon, Prismatic Ancient 2014

CR 21 dragon

Gargantuan dragon, neutral

Armor Class
20 (natural armor)
Hit Points
407 (22d20+176)
Speed
50 ft., climb 40 ft.
STR25 (+7)
DEX10 (+0)
CON27 (+8)
INT20 (+5)
WIS17 (+3)
CHA19 (+4)
Saving Throws
Dexterity +7, Constitution +1, Wisdom +1, Charisma +1
Skills
Perception +3
Damage Immunities
radiant
Condition Immunities
blinded
Senses
blindsight 60 ft., darkvision 120 ft., passive Perception 27
Languages
Common, Draconic
Challenge
21 (33,000 XP) · Proficiency Bonus +7
Legendary Resistance (3/Day).

Choose to succeed failed save.

Legendary Actions

Detect.

Makes a Wis (Perception) check.

Tail Attack.

Makes a tail attack.

Cast a Spell (Costs 2 Actions).

Uses Spellcasting.

Shimmering Wings (Costs 2 Actions).

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

Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details