The Coming Storm. Cetus is followed by an impenetrable storm, wherever Cetus appears a great storm will follow often knocking ship around making the wind cycle and cyclone in so many directions that boats are rendered inert.
Frightful Presence: Each creature of the dragon's choice that is within 120 ft. 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.
Spellcasting: Cetus is a 5th level spellcaster. Its spellcasting ability is [20] (spell save DC 18, +5 to hit with spell attacks). Cetus has following evocation spells prepared:
Cantrips (at will): Frostbite, Ray of Frost
3rd level (5 slots): Wall of Water, Tidal Wave, Counterspell
5th level (2 slots): Maelstrom
Multi-attack. Cetus can use one bite and one tail grab in one action.
Tail Grab. Cetus can grab one creature with his tail, the creature must succeed on a DC 20 Athletics or Acrobatics check or be grappled. Grappled creatures take (2d12+4) damage at the start of Cetus' next turn.
Bite. Cetus bites down on 2 creatures of it's choice, Melee Attack (+7) to hit, (3d12) piercing damage. If both attacks hit the same creature, that creature is grappled, then swallowed if they fail a DC15 dexterity saving throw. On a success they are held in Cetus' mouth. The check is repeated at the start of Cetus' turn to swallow the grappled creature. Creature is let go if a total of 30 damage is done in one attack and regurgitated if 40 damage is done in one attack. creatures take (1d12) piercing damage at the start of their turn if grappled in this manner. Bite cannot be used if Cetus has a creature in it's mouth.
Tail Whip. Cetus uses his tail (if not used to grapple) to smash a target. Melee Attack (+7) to hit, (2d8) bludgeoning damage. Instantly crits on structures.
Water Shield. (Once per turn) Cetus creates a water shield around his head and neck above water halving all damage taken and making him immune to fire damage. Duration: 1 minute.
Kings Call. Cetus is a king of the sea, as such when he calls many answer. When Cetus uses Kings Call he may summon one group of enemies from the list below. Once this call is used it cannot be used until the end of his next turn. The summoned creatures begin their attacks after Cetus' next turn and a total of 15 creatures can be in active combat at once. If you have more then 15 creatures only 15 may be in active imitative at once. When one dies the next is added to initiative.
(Option 1) - (1d4+4) Steam Mephit, (1d4+4) Kuo-toa
(Option 2) - (1d4) Merrow, (1d4) Harpy
(Option 3) - (1d4) Kuo-toa Monitor
(Option 4) - 1 Chuul
(Option 5) - 1 Sahuagin Baron
Mythic Action Name. Enter the description for how mythic actions work for your monster here.
Mythic Action Name (Costs # Actions). Enter the description for your mythic action.
Description
Cetus is the king of the oceans, tales of his defeat are often grand to obscure that fact that his defeat is nearly impossible. His body is nearly 100ft long, made of blue dragon scales , Cetus is capable of using his body to hold ships in place. At his side are smaller fin like arms that protrude just under the water. His face is also dragon like with gills on each side, he has 3 rows of teeth and yellow shining eyes. His gargantuan body is capable of moving through the water at blistering speeds and the storm that follows him is deadly to unprepared sailors.
His back is lined with orange/yellow fins that run the whole way along his body. One of Poseidon's toughest creatures often sent to destroy whole costal towns and take down threats to his realm. Cetus is unchained however and can/will attack sailors that get too close or simply to show his own power.
(Notes) Cetus has been made as a boss fight for my level 5 party. You may be thinking "That's far to strong for level 5" and I agree that's why their on a ship with a crew of around 12 more people and the real fight is with the monsters he summons. To fight him he has parts of his body holding the ship with a separate hp value to let go of the ship. If they get all of his grips undone he will retreat. Take all of this into account when looking at my version of Cetus and if you do wish to use him adjust accordingly :) happy hunting.
Lair and Lair Actions
Cetus' Lair is a moving storm that follows him wherever he goes within any ocean. The storm is a heavy thunderstorm that almost blots out the sun and is accompanied with lightning and thunder, a show of his power even commanding his uncles domain.
Lair Actions
On initiative count 15 (losing initiative ties), Cetus takes a lair action to cause one of the following effects; Cetus can’t use "Calm before the storm" effect two rounds in a row:
- Rock the boat - Any ship inside the storm is caused to rock harshly on the rocky water. Everyone on the ship must succeed a DC15 dexterity saving throw of be thrown 10 feet in a random direction and become prone. If they hit a railing of the boat they are on the must succeed on a DC10 dexterity saving throw or be knocked off the boat.
- Calm before the storm - All weather related surroundings are made inert, this doubles the effect of "rock the boat" if it is the next lair action used (They go 20ft instead of 10 and the DC is increased to 20)
Regional Effects
BRACE FOR A STOOOOOORRRRRRMMMMMM, STOOOOOOOOOOOORRRRMMMMMM. THE LIKES OF WHICH YOU'VE NEVER SEEN BEFORE!
Previous Versions
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2/14/2026 6:45:07 PM
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Coming Soon
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