Elemental Water Dragon

Family: Elemental Air Dragon

Huge elemental, neutral evil

Armor Class 17
Hit Points 310 (27d12 + 135)
Speed 40 ft., fly 60 ft., swim 80 ft.

25 (+7) 24 (+7) 21 (+5) 16 (+3) 14 (+2) 19 (+4)

Saving Throws Dexterity +13, Constitution +11, Wisdom +8, Charisma +10
Skills Arcana +9, Nature +9, Perception +14, Stealth +13
Damage Resistances acid; bludgeoning, piercing, and slashing from nonmagical weapons
Damage Immunities poison
Condition Immunities exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconscious
Senses blindsight 60 ft., darkvision 120 ft., passive Perception 24
Languages Aquan, Common
Challenge 17 (18,000 XP)

Special Traits

  • Freeze. If the elemental water dragon takes cold damage, it partially freezes; its speed is reduced by 20 feet until the end of its next turn.
  • Innate Spellcasting. The dragon’s innate spellcasting ability is Charisma (spell save DC 18, +10 to hit with spell attacks). It can cast the following spells, requiring no material components:
  • Legendary Resistance (3/day). If the dragon fails a saving throw, it can choose to succeed instead.
  • Siege Monster. The dragon deals double damage to objects and structures.


  • Multiattack. The dragon can make three attacks: one with its bite and two with its claws.
  • Bite. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage.
  • Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) slashing damage.
  • Tail. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.
  • Steam Breath (Recharge 5-6). The dragon exhales a 60-foot cone of superheated steam that spreads around corners. Creatures within the area must make DC 19 Dexterity saving throws, taking 63 (18d6) fire damage on a failed saving throw, or half as much on a successful one. Being underwater does not provide resistance to this effect.

Bonus Actions

  • Drench. The elemental water dragon can extinguish any one nonmagical flame or one magical flame created by a 5th level or lower spell it can see within 15 feet of it.

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 19 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.


This creature resembles a massive dragon composed entirely of water. Its wings slosh and drip water as it moves them. Its great mouth opens into a maw of inky darkness. Water drips from its fangs.

From the Plane of Water comes the elemental water dragon (also called water wyrm by some sages). They make their homes in the deep oceans of the Material Plane and are rarely found far away from large expanses of water. An elemental water dragon is composed entirely of water and commands respect from the more intelligent sea creatures as well as those humanoids that ply their trade upon the waters.

Elemental water dragons are evil and take great pleasure in demanding sacrifice from those that dare enter their realm. If the sacrifice placates the dragon, it lets the creature pass unabated; otherwise, it attacks with all of its might and most often destroys those that offend it or fail to appease its desires. Water dragons take great pleasure in capsizing and sinking ships.

Particularly evil water dragons may accept a sacrifice and then sink the ship of those that crossed its path anyway. On occasion, a group of skum or other evil aquatic creatures can be found allied with an elemental water dragon, but this alliance is usually short-lived and often shaky. It generally ends with the elemental water dragon feeding on its former allies.

Elemental water dragons prefer to fight in or near water where they can use their transparency and water mastery abilities to full advantage. They prefer to attack from ambush, often lying in wait for their opponents and then springing from the waves to assault their foes.

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