b'Ziphius \n'b'  Gargantuan   aberration ,  neutral  \n'b'  Armor Class  16 (natural armor)  Hit Points  135 (10d20 + 30)  Speed  10 ft., swim 60 ft.\n'b' STATS STR: 19 (+4) DEX:  13 (+1)  CON:  16 (+3)  INT:  9 (-1)  WIS:  13 (+1)  CHA:  4 (-3)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Saving Throws   Strength  +7  Skills   Perception  +4  Damage Resistances  cold; bludgeoning, piercing and slashing from nonmagical attacks  Condition Immunities   prone   Senses   blindsight  120 ft., passive  Perception  14  Languages  Aquan, telepathy 120 ft.  Challenge  8 (3,900 XP) \n'b' Special Traits \n'b'\n'b'  Charge . If the ziphius moves at least 20 feet straight toward a target and then hits it with a dorsal fin attack on the same turn, the target takes an extra 27 (5d10) slashing damage. \n'b'  Siege Monster . The ziphius deals double damage to objects and structures. \n'b'  Telepathic Foresight . As a  bonus action  at the start of its turn, the ziphius can choose one creature within 120 feet that it can see. The ziphius\xe2\x80\x99 eyes glow, and the target must succeed on a DC 15  Wisdom  saving throw or the ziphius creates a temporary mental bond with the target until the start of the ziphius\xe2\x80\x99 next turn. While bonded, the ziphius reads the creature\xe2\x80\x99s surface thoughts, choosing to either gain advantage on attacks against that target or cause the target to have disadvantage on attacks against the ziphius. \n'b'  Water Breathing . The ziphius can breathe only underwater. \n'b'\n'b' Actions \n'b'\n'b'  Multiattack . The ziphius makes one beak  attack  and one claw  attack . \n'b'  Claw .  Melee Weapon Attack : +7 to hit, reach 5 ft., one target.  Hit : 14 (3d6 + 4) slashing damage. \n'b'  Beak .  Melee Weapon Attack : +7 to hit, reach 5 ft., one target.  Hit : 13 (2d8 + 4) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 15  Strength  saving throw or be swallowed by the ziphius. A swallowed creature is  blinded  and  restrained , it has total  cover  against attacks and other effects outside the ziphius, and it takes 14 (4d6) acid damage at the start of each of the ziphius\xe2\x80\x99 turns. The ziphius can have only one target swallowed at a time. If the ziphius takes 20 damage or more on a single turn from a creature inside it, the ziphius must succeed on a DC 13  Constitution  saving throw at the end of that turn or regurgitate the swallowed creature, which falls  prone  in a space within 10 feet of the ziphius. If the ziphius dies, a swallowed creature is no longer  restrained  by it and can escape from the corpse by using 20 feet of movement, exiting  prone . \n'b'  Dorsal Fin .  Melee Weapon Attack : +7 to hit, reach 10 ft., one target.  Hit : 20 (3d10 + 4) slashing damage. \n'b'\n'b' About \n'b' Commonly called a whale demon by sailors, the mane of bristles around the ziphius\xe2\x80\x99 face gives it an almost owl-like appearance as it cuts through the water with frightening speed. \n'b'  Easily Bribed . Living prey in the water quickly attracts a ziphius\xe2\x80\x99 attention. Many ships on routes where a ziphius is known to hunt keep a goat, sheep, or pig aboard to throw overboard as an offering if the ziphius\xe2\x80\x99 distinctive dorsal fin is spotted. In cases of desperation, a captive or galley slave may be substituted. \n'b'  Huge and Extra-Huge . The largest reported ziphius encountered was larger than the frigate it attacked and sank. However, even the smaller ones vary between enormous and impossibly large. Most ziphius encountered are at least 75 feet long. \n'b'  Deep Dwellers . The ziphius are said to have a dwelling in the deepest oceans, a place where the  sahuagin ,  deep ones , and a few archmages are their only visitors. It is called Cruugin, a monumental stone city set with glowing jewels, in reports from the few who claim to have visited. \n'b' Alternate Traits and Actions \n'b'  Source  ExpCod (Open Design) \n'b' The following changes allow GMs to alter a ziphius without modifying its challenge rating. \n'b'\n'b'  Capsize . If the ziphius moves at least 20 feet straight toward a seagoing vessel and then hits and damages it with a dorsal fin  attack  on the same turn, the vessel capsizes. A creature that can steer or otherwise control the vessel can prevent it from capsizing with a successful DC 16  Strength  ( Athletics ) check. If the craft is larger than the ziphius, the creature has advantage on this check, while a creature on a vessel smaller than the ziphius has disadvantage on this check. The ziphius does not possess the Charge ability. \n'b'  Coastal Dweller . The ziphius\xe2\x80\x99s walking speed increases to 30 ft. The ziphius\xe2\x80\x99s swim speed is reduced to 40 ft. \n'b'  Size  A coastal-dwelling ziphius is smaller than its deep-dwelling relatives, measuring no more than 45 feet long, but it retains its gargantuan  size . \n'b'  Large Stomach . The ziphius can have up to two targets swallowed at a time. When it takes 20 damage or more on a single turn from a creature inside it, the ziphius must succeed on a DC 13  Constitution  saving throw for each creature it has swallowed at the end of that turn or regurgitate the creature, which falls  prone  in a space within 10 feet of the ziphius. \n'b' The reach for the ziphius\xe2\x80\x99s Dorsal Fin  attack  is reduced to 5 ft.'