b'Linnorm, Vent \n'b'  Family:   Linnorm  \n'b'  Gargantuan   dragon ,  neutral evil  \n'b'  Armor Class  19 (natural armor)  Hit Points  247 (15d20 + 90)  Speed  20 ft., swim 80 ft.\n'b' STATS STR: 25 (+7) DEX:  14 (+2)  CON:  23 (+6)  INT:  14 (+2)  WIS:  14 (+2)  CHA:  17 (+3)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Saving Throws   Str  +12,  Dex  +7,  Con  +11,  Cha  +8  Skills   Intimidation  +8,  Perception  +7,  Survival  +7  Damage Resistances  fire  Damage Immunities  cold  Senses   blindsight  60 ft.,  darkvision  120 ft., passive  Perception  17  Languages  Common, Draconic  Challenge  16 (15,000 XP) \n'b' Special Traits \n'b'   Amphibious . The linnorm can breathe air and water. \n'b'  Blood Scent . The linnorm can smell blood in the water within 5 miles of it. It can determine whether the blood is fresh or old and what type of creature shed the blood. In addition, the linnorm has advantage on  Wisdom  ( Perception ) and  Wisdom  ( Survival ) checks to find or track a creature that doesn\xe2\x80\x99t have all its  hp . \n'b'  Actions \n'b'   Multiattack . The linnorm can use its Frightful Presence. It then makes three attacks: one with its bite and two with its tail. \n'b'  Bite .  Melee Weapon Attack : +12 to hit, reach 10 ft., one target.  Hit : 18 (2d10 + 7) piercing damage plus 14 (4d6) necrotic damage. \n'b'  Tail .  Melee Weapon Attack : +12 to hit, reach 20 ft., one target.  Hit : 16 (2d8 + 7) bludgeoning damage. The target is  grappled  (escape DC 18) if it is a Large or smaller creature and the linnorm doesn\xe2\x80\x99t have two other creatures  grappled . Until this grapple ends, the target is  restrained . \n'b'  Frightful Presence . Each creature of the linnorm\xe2\x80\x99s choice that is within 120 feet of the linnorm and aware of it must succeed on a DC 16  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 the creature\xe2\x80\x99s saving throw is successful or the effect ends for it, the creature is immune to the linnorm\xe2\x80\x99s Frightful Presence for the next 24 hours. \n'b'  Inky Breath (Recharge 5-6) . The linnorm exhales a cloud of briny ink in a 60-foot cone. Each creature in that area must make a DC 19  Constitution  saving throw. On a failure, a creature takes 52 (15d6) necrotic damage and is  blinded  for 1 minute. On a success, a creature takes half the damage and isn\xe2\x80\x99t  blinded . A  blinded  creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. \n'b'  About \n'b' The immense reptile soars through the water, long and sleek. Its powerful tail undulates rhythmically, threatening all in its terrifying wake. \n'b'  Terrors of the Deep . Vent linnorms live near hydrothermal fissures located in the deepest parts of the ocean. When they are not hunting, they can be found basking in their lairs, enjoying the dark, warm waters of their homes. They are proficient hunters whose diet includes all varieties of sharks and whales, giant squid, dragon turtles, dragon eels, and younger sea dragons. While they are generally solitary creatures, mated pairs sometimes team up to hunt ancient sea dragons and  kraken  before resuming their solitary lives. \n'b'  Primeval Dragons . Like their draconic kin, vent linnorms enjoy amassing hoards of treasure and burying it in the silty floor of their lairs. Young linnorms spend much of their time searching through the wreckage of sunken vessels, while older ones actively sink passing ships, eating the sailors and picking up the fallen treasures at their leisure. \n'b'  Aboleth Hunters . Through cleverness and scheming, aboleths often dominate vent linnorms for use as servants and war beasts, and enjoy doing so. For their part, linnorms despise aboleths for enslaving them. A vent linnorm who becomes aware of the presence of aboleths immediately ceases its current activity and moves to destroy its hated enemy.'