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Cloud Dragon, Ancient (Draco Nimbus Caelo)

Gargantuan dragon, neutral

Armor Class 19 (natural armor)
Hit Points 367 (21d20 + 147)
Speed 40 ft., fly 80 ft.

27 (+8) 13 (+1) 25 (+7) 21 (+5) 18 (+4) 19 (+4)

Saving Throws Dexterity +8, Constitution +14, Wisdom +11, Charisma +11
Skills Arcana +12, History +12, Insight +11, Nature +12, Perception +18
Damage Immunities cold, lightning
Senses blindsight 120 ft., darkvision 120 ft., passive Perception 28
Languages Auran, Aquan, Common, Draconic, Giant, Sylvan
Challenge 22 (41,000 XP)

Special Traits

  • Legendary Resistance (3/day). If the dragon fails a saving throw, it can choose to succeed instead.
  • Windborn. The dragon cannot be moved or knocked prone by magical or nonmagical winds of any kind.


  • Multiattack. The dragon uses its Frightful Presence and makes three attacks: one with its bite and two with its claws.
  • Bite. Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 10 (3d6) cold damage.
  • Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 22 (4d6 + 8) slashing damage.
  • Tail. Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 17 (2d8 + 8) 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 19 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.
    • Cloud Breath. The dragon exhales an icy blast in a 90-foot cone that spreads around corners. Each creature in that area must make a DC 22 Constitution saving throw, taking 72 (16d8) cold damage on a failed saving throw, or half as much damage on a successful one.
    • Wind Breath. The dragon exhales gale-force winds in a 90-foot line that is 10-feet wide. Creatures in this area must make a DC 22 Strength saving throw, taking 36 (8d8) bludgeoning damage on a failed saving throw and are pushed 90 feet directly away from the dragon. On a successful saving throw, the creature takes half damage and is not pushed. A creature who is pushed and strikes a solid surface takes 1d6 bludgeoning damage per 10 feet traveled. Nonmagical flames are completely extinguished, and magical flames created by a spell of 5th level or lower are immediately dispelled.
    • Cloud Form. The cloud dragon polymorphs into a Gargantuan cloud of mist, or back into its true form. While in mist form, the dragon can’t take any actions, speak, or manipulate objects. It is weightless, has a flying speed of 20 feet, can hover, and can enter a hostile creature’s space and stop there. In addition, if air can pass through a space, the mist can do so without squeezing, and it can’t pass through water. It has advantage on Strength, Dexterity, and Constitution saving throws, it is immune to all nonmagical damage, and still benefits from its Windborn feature.

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 23 Dexterity saving throw or take 15 (2d6 + 8) 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 can’t use the same effect two rounds in a row:

  • Sphere of Fog. The cloud dragon causes a 60-foot radius sphere of fog centered on a point anywhere in its lair. The sphere spreads around corners and its area is heavily obscured. The fog remains for 1 hour, or until the dragon dismisses it (no action required), and it cannot be dispersed by wind. On the next initiative count 20, the dragon can move the sphere up to 30 feet in any direction.
  • Wind Gust. The cloud dragon causes a burst of strong wind 60 feet long and 10 feet wide from it in a direction of the dragon’s choice. The strong wind lasts until the next initiative count 20. Each creature other than the cloud dragon that starts its turn or enters the area must succeed on a DC 19 Strength saving throw or be pushed 15 feet away from it. In addition, any creature in the area must spend 2 feet of movement for every 1-foot it moves when moving closer to the dragon, and the wind disperses gas or vapor of the dragon’s choice, and it extinguishes candles, torches, and similar unprotected flames in the area.
  • Freezing Air. The dragon causes a 20-foot sphere of air to drop to below freezing temperatures for 24 hours. Creatures in that area that start their turn or enter the area must make a DC 19 Constitution saving throw. On a failed saving throw, the target takes 14 (4d6) cold damage, or half as much damage on a successful one. The area affected by the spell is also covered in frost, leaving it difficult terrain for 24 hours.

Regional Effects

The region containing the ancient cloud dragon’s lair is changed by its presence, which creates one or more of the following effects: Wind and Fog. Strong winds whip and curl around the dragon’s lair, but fog clouds still linger regardless, cloaking the land within 6 miles of the dragon’s lair, making it lightly obscured.

  • Cold Snaps. Frigid cold snaps suddenly appear in areas within 6 miles of the dragon’s lair, dropping the temperature to below freezing in minutes.
  • Thin Air. The air thins at ground level and above, as if the inhabitants stood above altitudes of 10,000 feet or higher, in areas within 6 miles of the dragon’s lair. If the dragon dies, these effects fade over 1d10 days.
Section 15: Copyright Notice

Tome of Horrors © 2018, Frog God Games, LLC; Authors: Kevin Baase, Erica Balsley, John “Pexx” Barnhouse, Christopher Bishop, Casey Christofferson, Jim Collura, Andrea Costantini, Jayson ‘Rocky’ Gardner, Zach Glazar, Meghan Greene, Scott Greene, Lance Hawvermale, Travis Hawvermale, Ian S. Johnston, Bill Kenower, Patrick Lawinger, Rhiannon Louve, Ian McGarty, Edwin Nagy, James Patterson, Nathan Paul, Patrick N. Pilgrim, Clark Peterson, Anthony Pryor, Greg Ragland, Robert Schwalb, G. Scott Swift, Greg A. Vaughan, and Bill Webb