Olhydra (5e)

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Deific Summary[1] [2]
Princess of Evil Water, Crushing Wave, Dark Tide, Well of Endless Anguish

Type: Elemental Princess, Otherworldly Patron
Portfolio: Seas, lakes, rivers, and great subterranean pools
Gender: Female
Alignment: Neutral Evil
Domains: Tempest
Plane: Elemental Plane of Water
Worshipers: Cultists, Pirates, Raiders
Pantheon: Elemental Evil

In her natural state, Olhydra appears as a huge water elemental. She delights in causing destruction. She is powerful enough to be an otherworldly patron to warlocks and a power source to sorcerers. She is worshiped by cults of elemental evil who embrace her for her destructive nature.

Cults of Olhydra[edit]

As a Creature[edit]

Olhydra (Individual) (pointer) [1]
Huge Elemental (Elemental Princes), Neutral Evil
Armor Class: 18 (natural armor)
Hit Points: 324
Speed: 50 ft., swim 100 ft.
Saving Throws: Str, Con, Wis
Senses: blindsight 120 ft., passive Perception 14
Languages: Aquan
Challenge: 18 (20,000 xp)Proficiency Bonus (PB): +6


Empowered Attacks.

Innate Spellcasting.

Legendary Resistance (3/Day). [5] Olhydra has advantage on saving throws against spells and other magical effects.

Magic Resistance. [5] If Olhydra fails a saving throw, she can choose to succeed instead.

Water Form. [5] Olhydra can enter a hostile creature’s space and stop there. She can move through a space as narrow as 1 inch wide without squeezing. 



Slam. Melee Weapon Attack

Water Jet. Ranged Weapon Attack

Summon Elemental (1/Day).

Legendary Actions

The elemental 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 elemental regains spent legendary actions at the start of its turn.


Fling (Costs 2 Actions).

Water to Acid (Costs 3 Actions).

Unofficial Description: Elemental Princess of Evil Water

Olhydra's Lair

[1] Elemental Plane of Water, bodies of water on the Material Plane

Lair Actions

[1] When fighting inside its lair, an olhydra can use lair actions. On initiative count 20 (losing initiative ties), the elemental takes a lair action to cause one of the following effects; the elemental can’t use the same effect two rounds in a row:

  • Grasping Tide.
  • Murky Water.
  • Freezing Fog.

Regional Effects

[1] Waters near her lair

  • Violent Downpours.
  • Strong Currents and Tides.
  • Agressive Aquatic Creatures.
  • Water Portals.

If she dies, effects end within 1d10 days.

Found in Adventures[edit]

Sources and Notes[edit]

  1. 1.0 1.1 1.2 Richard Baker (2015). Princes of the Apocalypse. (5e) Wizards of the Coast. ISBN 0-7869-6578-6. p. 218-220. Licensed: © Wizards of the Coast (used under 'fair use' clause).
  2. portfolio - User:Rlyehable. Licensed: CC-BY-SA.
  3. PotA p.205
  4. Mike Mearis (2019). Ghosts of Saltmarsh. (5e) Wizards of the Coast. ISBN 0-7869-1640-0. p. 248. Licensed: © Wizards of the Coast (used under 'fair use' clause).
  5. 5.0 5.1 5.2 Trait matches the trait of the same name in the 5th ed. SRD. - Wizards RPG Team (6 May 2015). SRD-OGL v5.1. (5e) Wizards of the Coast. Licensed: OGL & CC-BY.

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Facts about "Olhydra (5e)"
AlignmentNeutral Evil +
AuthorPrinces of the Apocalypse +
CRval18 +
Canontrue +
Challenge Rating18 +
Creature NameOlhydra +
Deific TypeElemental Princess, Otherworldly Patron +
DomainTempest +
Experience Points20,000 +
FeaturesEmpowered Attacks +, Innate Spellcasting +, Legendary Resistance +, Magic Resistance +, Water Form +, Multiattack +, Slam +, Water Jet +, Summon Elemental +, Crush +, Fling + and Water to Acid +
GenderFemale +
Has Lairtrue +
Hit Points324 +
Individualtrue +
IndividualsTrue +
Legendary Monstertrue +
LineageElemental Princess, Otherworldly Patron +
NameOlhydra +
PantheonElemental Evil +
PlaneElemental Plane of Water +
PortfolioSeas +, lakes +, rivers + and and great subterranean pools +
PublicationPrinces of the Apocalypse +
SizeHuge +
SortTextOlhydra 5e +
SubtypeElemental Prince +
SummaryElemental Princess of Evil Water +
TypeElemental +
WorshipersCultists +, Pirates + and Raiders +