Legendary Resistance (4/Day). If the ceadeus fails a saving throw, it can choose to succeed instead.
Magic Resistance. The ceadeus has advantage on saving throws against spells and other magical effects.
Siege Monster. The ceadeus deals double damage to objects and structures.
Multiattack. The ceadeus makes one Bite attack and two Tail attacks.
Bite. Melee Weapon Attack. +15 to hit, reach 10 ft., one target. Hit: 21 (4d6 + 7) piercing damage.
Tail. Melee Weapon Attack. +15 to hit, reach 20ft., one target. Hit: 25 (4d8 + 7) bludgeoning damage.
Hydropump (Recharge 5-6). The ceadeus releases a high pressure stream of water in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 25 Dexterity saving throw, taking 90 (20d8) acid damage on a failed save, or half as much damage on a successful one.
Bioluminescence. The ceadeus emits dim light from its body in a 5-foot radius, increases the illumination to bright light in a 5- to 20-foot radius (and dim light for an additional number of feet equal to the chosen radius), or extinguishes the light.
The ceadeus 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 ceadeus regains spent legendary actions at the start of its turn.
Detect. The ceadeus makes a Wisdom (Perception) check.
Tail Attack. The ceadeus makes one Tail attack.
Torpedo (Costs 2 Actions). The ceadeus swims up to its swim speed, during this movement it can swim through other creatures without provoking opportunity attacks. Each creature the ceadeus moves through must succeed on a DC 17 Dexterity saving throw or take 21 (4d6 + 7) bludgeoning damage and be knocked prone.
Description
Ceadeus are giant sea dwelling Elder Dragons that share a common ancestor with the jhen mohran. Older ceadeus individuals are called goldbeard ceadeus. Ceadeus has a special relationship with an algae, which is the reason why it has its beard. Using its beard, the ceadus collects the algae and uses the glow from the luminous bacteria as a form of photosynthesis.
With this algae, ceadeus can spend longer times under the depths without having to come up for air. When it needs air, it will swim up with a burst of speed and jump out of the water for a breath. It is estimated a ceadeus can hold its breath for about several months. Ceadeus has powerful fins and a tail fin designed for swimming in the sea with both power and grace. The horns of a ceadeus never stop growing, and at times, the Elder Dragon will grind them against the seafloor, with enough force to produce earthquakes and tsunamis.
It is believed that this behavior resulted in the destruction of an island on at least one occasion. Throughout their years, ceadeus are able to use an organ called the Luminous Organ. This organ is used to help farm the algae it uses to breathe.
The ceadeus is known to be a rather peaceful creature until provoked. It won't take notice of adventurers until it is greatly damaged by them. If ceadeus is provoked, it'll try to kill its enemy with its immense strength.
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