Gargantuan dragon, lawful good

Armor Class: 22

Hit Points: 444

Speed: 40 ft , fly: 80 ft , swim: 40 ft

STR

29 +9

DEX

10 +0

CON

27 +8

INT

18 +4

WIS

17 +3

CHA

21 +5

Saving Throws: DEX +7, CON +15, WIS +10, CHA +12

Skills: Insight +10, Perception +17, Stealth +7

Damage Immunities: Lightning

Senses: Blindsight 60ft., Darkvision 120ft., Passive Perception 27

Languages: Common, Draconic

Challenge Rating: 22 ( 41000 XP)

Proficiency Bonus: +7

Actions

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 20 (2d10 + 9) piercing damage.   Claw. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 16 (2d6 + 9) slashing damage.   Tail. Melee Weapon Attack: +16 to hit, reach 20 ft., one target. Hit: 18 (2d8 + 9) bludgeoning damage.   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 20 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.   Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.   Lightning Breath. The dragon exhales lightning in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 23 Dexterity saving throw, taking 88 (16d10) lightning damage on a failed save, or half as much damage on a successful one.   Repulsion Breath. The dragon exhales repulsion energy in a 30-foot cone. Each creature in that area must succeed on a DC 23 Strength saving throw. On a failed save, the creature is pushed 60 feet away from the dragon.   Change Shape. The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the dragon's choice).

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 15 feet of the dragon must succeed on a DC 24 Dexterity saving throw or take 16 (2d6 + 9) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

Lair Actions

On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects:

• The dragon creates fog as though it had cast the Fog Cloud spell. The fog lasts until initiative count 20 on the next round.
• A thunderclap originates at a point the dragon can see within 120 feet of it. Each creature within a 20-foot radius centered on that point must make a DC 15 Constitution saving throw or take 5 (1d10) thunder damage and be deafened until the end of its next turn.

• Ocean’s Call. The dragon conjures a swarm of spectral dolphins. Each creature in the water within 120 feet of the dragon must succeed on a DC 15 Dexterity saving throw or take 5 (1d6) slashing damage; then the swarm vanishes.
• Salt Burst. The dragon chooses a point it can see in the lair. The air in a 20-foot-radius sphere centered on that point bursts with abrasive salt crystals. Each creature in that area must succeed on a DC 15 Dexterity saving throw or take 10 (3d6) slashing damage.
• Whelming Water. The dragon causes a strong current to course through the water in its lair. The dragon chooses any number of creatures it can see that are standing or swimming in water within 120 feet of it. Each chosen creature must succeed on a DC 15 Strength saving throw or be knocked prone.

A bronze dragon lairs in coastal caves. It might salvage a wrecked ship, reconstruct it within the confines of its lair, and use it as a treasure vault or nest for its eggs.

• Sentinel Statue. In a hidden cove sheltered from the sea, a statue of a dour elf queen watches over a small beach. The statue’s eyes are magically warded to alert the dragon of intruders.
• Campaign Chamber. Beyond the beach stands a pillared dwarven hall whose walls have begun to crumble near the entrances. Here the dragon grants audiences and presides over councils of war, surrounded by trophies chosen to remind viewers of the dragon’s heroic history.
• Lofty Alcove. Up a steep set of stairs at the bottom right of the map lies a dry chamber that serves as barracks for guests and a library for documents too fragile to survive in damp conditions.
• Island Larder. Another elevated chamber carved into the cliffs of a small island abutting the beach (in the center right of the map) serves as a larder in case of a siege. It also houses a clever series of mirrors arranged throughout the stone to allow the dragon to observe the seascape unnoticed.
• Watery Caves. Two chambers near the top of the map are accessible only via submerged tunnels, their entrances disguised with thick seaweed and boulders. The larger cavern on the right is the dragon’s sleeping chamber, while the smaller on the left holds most of the dragon’s hoard.

Regional Effects

The region containing a legendary bronze dragon’s lair is warped by the dragon’s magic.

• Once per day, the dragon can alter the weather in a 6-mile radius centered on its lair. The dragon doesn’t need to be outdoors; otherwise the effect is identical to the control weather spell.
• Underwater plants within 6 miles of the dragon’s lair take on dazzlingly brilliant hues.
• Within its lair, the dragon can set illusory sounds, such as soft music and strange echoes, so that they can be heard in various parts of the lair.

• Phantom Escort. Ghostly naval ships from an ancient armada appear, escorting well-meaning creatures in need of the dragon’s help toward the dragon’s lair.
• Underwater Pursuit. Sailors glimpse the shadowy, illusory form of a dragon in the depths below them, keeping pace with their vessel.
• Unfailing Faithfulness. Sapient creatures that spend a year within 10 miles of the dragon’s lair find it nearly impossible to break a promise.

Suggested Environments

Coastal