Siege Monster. The dragon deals double damage to objects and structures.
Unusual Nature. The dragon doesn’t require air or sleep.
Living Reactor. Poison bypasses damage resistances and immunity. Creatures immune to the poison condition are not immune to the Atomic Dragons poison.
Multiattack. The dragon makes one Bite attack, two Claw attacks, and one Tentacle attack.
Bite. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 19 (1d10 + 8) piercing damage plus 11 (2d10) poison damage.
Claw. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 11 (1d6 + 8) slashing damage.
Tentacle. Melee Weapon Attack: +10 to hit, reach 15 ft., one creature. Hit: 12 (1d8 + 8) psychic damage. If the target is Large or smaller, it is grappled (escape DC 18). The dragon can have up to four targets grappled at a time.
Radiation Breath (Recharge 5–6). The dragon exhales radiation in a 120-foot line that is 15 feet wide. Each creature in that area must make a DC 20 Constitution saving throw, taking 30 (6d10) fire damage on a failed save, or half as much damage on a successful one. On a success or failure, if the creature isn’t a Construct or an Undead, it becomes afflicted with radiation poisoning.
While afflicted, the creature takes 11 (2d10) poison damage at the start of each of its turns. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself after it succeeds on three of these saves. If the creature is targeted by magic that ends a curse or restores 40 hit points or more, the radiation afflicting the creature is dissipated, ending the effect on the creature.
If a Humanoid is reduced to 0 hit points while afflicted, the creature is stable but remains unconscious for 6d12 hours. When the period of unconsciousness ends, the creature transforms into a Draconian Dreadnought (see the Fizban’s Treasury of Dragons) with all its hit points. Casting a wish spell on the unconscious creature rids it of the affliction and prevents it from turning into a draconian dreadnought.
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action 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.
Tentacle. The dragon makes one Tentacle attack.
Shatter Concentration (Costs 2 Actions). The dragon targets a creature it is grappling. The target’s concentration on a spell it has cast or an ability it is maintaining ends, and the target takes 19 (3d12) psychic damage.
Description
The abomination known as the Atomic Dragon comes from the continued transformations and experiments of the Inquisitor Ichiban Samradh turning himself into yet another affront to the gods. By eating a small sun, it turns itself into a living reactor spreading radiation wherever it goes.
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