b'Gray Dragon, Ancient \n'b'  Family:   Dragon - Gray  \n'b'  Gargantuan   dragon ,  neutral evil  \n'b'  Armor Class  21 (natural armor)  Hit Points  455 (26d20 + 182)  Speed  40 ft., fly 80 ft., swim 40 ft.\n'b' STATS STR: 28 (+9) DEX:  14 (+2)  CON:  25 (+7)  INT:  19 (+4)  WIS:  19 (+4)  CHA:  19 (+4)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Saving Throws   Dexterity  +9,  Constitution  +14,  Wisdom  +11,  Charisma  +11  Skills   Perception  +18,  Stealth  +9  Damage Immunities  fire  Senses   blindsight  60 ft.,  darkvision  120 ft., passive  Perception  28  Languages  Abyssal, Aquan, Common, Draconic, Giant  Challenge  21 (33,000 XP) \n'b' Special Traits \n'b'   Amphibious . The dragon can breathe air and water. \n'b'  Legendary Resistance (3/day) . If the dragon fails a saving throw, it can choose to succeed instead. \n'b'  Actions \n'b'   Multiattack . The dragon uses its Frightful Presence and makes three attacks: one with its bite and two with its claws. \n'b'  Bite .  Melee Weapon Attack : +16 to hit, reach 15 ft., one target.  Hit : 20 (2d10 + 9) piercing damage plus 7 (2d6) fire damage. \n'b'  Claw .  Melee Weapon Attack : +16 to hit, reach 10 ft., one target.  Hit : 16 (2d6 + 9) slashing damage. \n'b'  Tail .  Melee Weapon Attack : +16 to hit, reach 20 ft., one target.  Hit : 18 (2d8 + 9) bludgeoning damage. \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 20  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 of the effect ends for it, the creature is immune to the dragon\xe2\x80\x99s Frightful Presence for the next 24 hours. \n'b'  Steam Breath (Recharge 5-6) . The dragon exhales steam in a 90-foot cone. Creatures in the area must make a DC 22  Constitution  saving throw. On a failed saving throw, the creature takes 80 (23d6) fire damage, or half as much damage on a successful saving throw. Being underwater doesn\xe2\x80\x99t grant  resistance  to this damage. \n'b'  Legendary Actions \n'b' The 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 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'  Wing Attack (Costs 2 Actions) . The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 24  Dexterity  saving throw or take 16 (2d6 + 9) bludgeoning damage and be knocked  prone . The dragon can then fly up to half its flying speed. \n'b'  Lair Actions \n'b' On  initiative  count 20 (losing  initiative  ties), the dragon takes a lair action to cause one of the following effects; the dragon can\xe2\x80\x99t use the same effect two rounds in a row: \n'b'   Dead Water . A 30-foot cube of water the dragon can see within 120 feet of it stagnates and becomes unable to support life of any kind. Aquatic creatures or creatures benefiting from spells such as water-breathing cannot survive in the area and begin suffocating. The dragon can end this effect at any time. \n'b'  Steam Cloud . The dragon causes an area of water within 120 feet of it to superheat, creating a cloud of fog in a 60-foot radius sphere. The sphere spreads around corners and its area is heavily  obscured . The  fog cloud  remains for 1 hour or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it. \n'b'  Control Water . The dragon can cause an area of water to act as if the spell  control water  was cast on it. The dragon does not have to concentrate on this effect, and it remains active for the duration or until the dragon dismisses it (no action required). \n'b'  Regional Effects \n'b' The region containing the ancient gray dragon\xe2\x80\x99s lair is changed by its presence, which creates one or more of the following effects: Obscuring Fog. Twenty-foot areas of fog and steam dot the landscape within 6 miles of the lair. These areas are heavily  obscured . \n'b'  Heavy Tides . Tides are supernaturally heavy and inundate coastal areas, causing massive flooding. If the dragon dies, these effects fade over 1d10 days.'