b'Dragon, Ketos \n'b'\n'b'  Gargantuan   dragon ,  chaotic evil  \n'b'  Armor Class  22 (natural armor)  Hit Points  367 (21d20 + 147)  Speed  40 ft., swim 40 ft.\n'b' STATS STR: 27 (+8) DEX:  14 (+2)  CON:  25 (+7)  INT:  8 (-1)  WIS:  15 (+2)  CHA:  14 (+2)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Saving Throws   Dexterity +7,  Constitution +12,  Wisdom +7,  Charisma +7  Damage Immunities  thunder  Damage Resistances  bludgeoning, piercing, and slashing from nonmagical attacks  Condition Immunities   prone   Skills   Perception  +7,  Stealth  +7  Senses   darkvision  120 ft., passive  Perception  17  Languages  Draconic  Challenge  24 (62,000 XP) \n'b' Special Traits \n'b'   Amphibious . The dragon can breathe air and water. \n'b'  Legendary Resistances (3/Day) . If the dragon fails a saving throw, it can choose to succeed instead. \n'b'  Actions \n'b'   Multiattack . The dragon can use its Frightful Presence. It then makes two attacks: one with its bite and one to constrict. \n'b'  Bite .  Melee Weapon Attack : +13 to hit, reach 15 ft., one target.  Hit : 19 (2d10 + 8) piercing damage. \n'b'  Constrict .  Melee Weapon Attack : +13 to hit, reach 20 ft., one Large or smaller creature.  Hit : 19 (2d10 + 8) bludgeoning damage. The target is  grappled  (escape DC 21) if the ketos dragon isn\xe2\x80\x99t already constricting a creature, and the target is  restrained  until this grapple ends. \n'b'  Thunder Breath (Recharge 5-6) . The dragon exhales acid in a 90-foot cone. Each creature in that cone must make a DC 20  Constitution  saving throw, taking 67 (15d8) thunder damage on a failed save, or half as much damage on a successful one. \n'b'  Frightful Presence . Each creature of the dragon\xe2\x80\x99s choice that is within 120 feet of the dragon and aware of it must succeed on a DC 15  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\xe2\x80\x99s saving throw is successful or the effect ends for it, the creature is immune to the dragon\xe2\x80\x99s Frightful Presence for the next 24 hours. \n'b'  Swallow . The ketos dragon makes one bite  attack  against a Medium or smaller target it is grappling. If the  attack  hits, the target is also swallowed, and the grapple ends. While swallowed, the target is  blinded  and  restrained , it has total  cover  against attacks and other effects outside the ketos dragon, and it takes 21 (6d6) acid damage at the start of each of the ketos dragon\xe2\x80\x99s turns. An ketos dragon can have only one creature swallowed at a time. If the ketos dragon takes 30 damage or more on a single turn from the swallowed creature, the ketos dragon must succeed on a DC 20  Constitution  saving throw at the end of that turn or regurgitate the creature, which falls  prone  in a space within 10 feet of the ketos dragon. If the ketos dragon dies, a swallowed creature is no longer  restrained  by it and can escape from the corpse by using 15 feet of movement, exiting prone. \n'b'  Tail .  Melee Weapon Attack : +13 to hit, reach 20 ft., one target.  Hit : 17 (2d8 + 8) bludgeoning damage. \n'b'  Legendary Actions \n'b' The ketos 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\xe2\x80\x99s turn. The ketos dragon regains spent legendary  actions  at the start of its turn. \n'b'   Detect . The dragon makes a  Wisdom  ( Perception ) check. \n'b'  Tail Attack . The dragon makes a tail  attack . \n'b'  Chomp (Costs 2 Actions) . The ketos dragon makes one bite  attack  or uses its Swallow. \n'b'  About \n'b' This sea serpent is entirely aquatic, with hundreds of fins dispersed amongst its coils ending in a fish-like tail. Its eyes flicker brightly when roused and its roar is like thunder. \n'b' Ketos dragons enjoy snatching morsels from coasts and off ships. For this reason, ketos dragons are often given sacrifices.'