Ancient Prismatic Dragon (5e Creature)

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Design Note: This creature was designed using Mythic Monsters (5e Variant Rule) as a guide.

Ancient Prismatic Dragon[edit]

Titanic dragon, neutral


Armor Class 24 (natural armor)
Hit Points 968 (16d100 + 160)
Speed 50 ft., fly 100 ft.


STR DEX CON INT WIS CHA
30 (+10) 14 (+2) 30 (+10) 22 (+6) 19 (+4) 30 (+10)

Saving Throws Dex +12, Con +21, Wis +14, Cha +22
Skills Perception +24, Stealth +12
Damage Immunities radiant; bludgeoning, piercing, and slashing from nonmagical weapons
Condition Immunities blinded
Senses blindsight 120 ft., darkvision 240 ft., passive Perception 34
Languages Common, Draconic
Challenge 36 (290,000 XP)


Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Light Immunity. The dragon is immune to light-based spells and effects such as prismatic spray.

Siege Monster. The dragon deals double damage to objects and structures.

ACTIONS

Multiattack. The dragon can use its Frightful Presence. It then makes one bite attack and two claw attacks. It may use its Crush or Swallow in place of its bite.

Bite. Melee Weapon Attack: +20 to hit, reach 20 ft., one target. Hit: 32 (4d10 + 10) piercing damage plus 21 (6d6) radiant damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and the dragon can't bite another target.

Claw. Melee Weapon Attack: +20 to hit, reach 15 ft., one target. Hit: 24 (4d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +20 to hit, reach 25 ft., one target. Hit: 28 (4d8 + 10) bludgeoning damage, and the target must succeed on a DC 28 Strength saving throw or be knocked prone.

Crush. The dragon attempts to crush its foes underneath it using its weight. All creatures in the dragon's space must make a DC 28 Dexterity saving throw. On a success, a creature is not crushed, and moves out of the dragon's space to a space adjacent to the dragon. On a failure, a creature becomes grappled by the dragon (escape DC 20). While grappled in this manner, a creature is also considered prone and restrained, and takes 28 (4d8 + 10) bludgeoning damage at the start of each of the dragon's turns. A creature is freed from this grapple when the dragon moves.

Swallow. The dragon makes one bite attack against a Gargantuan or smaller creature it is grappling. If the attack hits, the target takes the bite's damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the dragon, and it takes 81 (18d8) acid damage at the start of each of the dragon's turns.
If the dragon takes 60 damage or more on a single turn from a creature inside it, the dragon must succeed on a Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the dragon. The DC for this saving throw equals one-third the damage taken during that single turn. If the dragon dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 28 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Prismatic Breath (Recharge 5-6). The dragon exhales prismatic energy in a 120-foot cone, which manifests as eight multicolored rays of light. Each ray is a different color and has a different power and purpose. Each creature in the area of effect must make a DC 28 Dexterity saving throw, and each creature also rolls a d8 to see which color ray affects them:

1. Red. The target takes 104 (16d12) fire damage on a failed save, or half as much damage on a successful one.
2. Orange. The target takes 104 (16d12) acid damage on a failed save, or half as much damage on a successful one.
3. Yellow. The target takes 104 (16d12) lightning damage on a failed save, or half as much damage on a successful one.
4. Green. The target takes 104 (16d12) poison damage on a failed save, or half as much damage on a successful one.
5. Blue. The target takes 104 (16d12) cold damage on a failed save, or half as much damage on a successful one.
6. Indigo. On a failed save, the target is restrained. It must then make a DC 28 Constitution saving throw at the end of each of its turns. If it successfully saves three times, the spell ends. If it fails its save three times, it permanently turns to stone and is subjected to the petrified condition. The successes and failures don't need to be consecutive; keep track of both until the target collects three of a kind.
7. Violet. On a failed save, the target is blinded. It must then make a DC 28 Wisdom saving throw at the start of the dragon's next turn. A successful save ends the blindness. If it fails that save, the creature is transported to another plane of existence of the GM's choosing and is no longer blinded. (Typically, a creature that is on a plane that isn't its home plane is banished home, while other creatures are usually cast into the Astral or Ethereal planes.)
8. Special. The target is struck by two rays. It rolls twice more, rerolling any 8's.

REACTIONS

Bloodied Breath. When the dragon falls below half its hit point maximum, it uses its prismatic breath. The dragon does not need to have its prismatic breath charged, and using its breath in this manner does not consume its charge. Once the dragon uses this reaction, it can't use it again until it reaches its hit point maximum.

LEGENDARY ACTIONS

The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.
Tail Attack. The dragon makes a tail attack.
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 25 feet of the dragon must succeed on a DC 28 Dexterity saving throw or take 26 (4d6 + 10) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

See Dragons (5e Creature).



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