River King

Medium Fey Chaotic Neutral

• Armor Class: 18 (natural armor)
• Hit Points: 190 (20d8 + 100)
• Speed: walk 60 ft.
• Challenge Rating: 16 (15,000 XP)
• Source: Tome of Beasts 2023, page 182

• Saving Throws: Dex +8, Con +10, Wis +6
• Skills: Intimidation +8, Nature +7, Perception +6, Stealth +8
• Damage Vulnerabilities: False
• Damage Immunities: poison
• Damage Resistances: cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks not made with cold iron weapons
• Condition Immunities: charmed, exhaustion, frightened
• Senses: blindsight 10 ft., darkvision 120 ft., passive Perception 16
• Languages: Common, Elvish, Giant, Primordial

Special Abilities

• Amphibious: The River King can breathe air and water.
• Legendary Resistance (3/Day): If the River King fails a saving throw, he can choose to succeed instead.
• Riparian Weapons: The River King's weapon attacks are magical. When he hits with any weapon, the weapon deals an extra 10 (3d6) poison damage (included in the attack).

Actions

• Multiattack: The River King makes two Longsword or Flood Blast attacks.
• Longsword: Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) slashing damage, or 10 (1d10 + 5) slashing damage if used with two hands, plus 10 (3d6) poison damage.
• Flood Blast: Ranged Spell Attack: +8 to hit, range 120 ft., one target. Hit: 21 (4d8 + 3) bludgeoning damage, and the target must succeed on a DC 18 Strength saving throw or be pushed up to 30 feet away from the River King and knocked prone.
• Grasping Whirlpool (Recharge 5-6): The River King magically creates a swirling vortex of water centered on a point he can see within 60 feet. The vortex appears in the shape of a cylinder that is 15 feet tall with a 10-foot radius. Each creature in the area must make a DC 18 Strength saving throw. On a failure, a creature takes 36 (8d8) bludgeoning damage and is restrained. On a success, a creature takes half the damage, isn't restrained, and can choose to be pushed out of the whirlpool's space. A creature that chooses not to be pushed suffers the consequences of a failed saving throw. While restrained, a creature is unable to breathe unless it can breathe water, and it must succeed on a DC 18 Strength saving throw at the end of each of its turns or take 18 (4d8) bludgeoning damage. A creature, including the restrained creature, can take an action to free the restrained creature by succeeding on a DC 18 Strength check. A creature with a swimming speed has advantage on the saving throw and on the Strength check to escape.
• Spellcasting: The River King casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (save DC 16):
  At will: create or destroy water, water breathing
  3/day each: freedom of movement, control water
  1/day: control weather (as an action)

Reactions

• Blade Current: When a creature within 5 feet of the River King stands up from prone, he can make one Longsword attack against that creature.

The River King 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 River King regains spent legendary actions at the start of his turn.

Legendary Actions

• Attack: The River King makes a Longsword or Flood Blast attack.
• Flow: The River King moves up to his walking speed, or swims up to half his swimming speed, without provoking opportunity attacks.
• Ripple (Costs 2 Actions): The River King magically ripples like sunlight on the surface of water. Until the start of his next turn, attack rolls against him have disadvantage.

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