b'Serpent of the Duat \n'b'  Gargantuan   fiend ,  chaotic evil  \n'b'  Armor Class  19 (natural armor)  Hit Points  279 (18d20 + 90)  Speed  60 ft., climb 20 ft., fly 60 ft.\n'b' STATS STR: 27 (+8) DEX:  80 (+0)  CON:  00 (+5)  INT:  56 (+3)  WIS:  36 (+3)  CHA:  38 (+4)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Saving Throws   Str  +14,  Con  +11,  Int  +9,  Wis  +9,  Cha  +10  Skills   Arcana  +9,  Athletics  +14  Damage Resistances  cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks  Damage Immunities  poison  Condition Immunities   poisoned   Senses   darkvision  120 ft., passive  Perception  13  Languages  Abyssal  Challenge  18 (20,000 XP) \n'b' SPECIAL TRAITS \n'b'\n'b'  Innate Spellcasting . The serpent of the Duat\xe2\x80\x99s spellcasting ability is  Charisma  (spell save DC 18, +10 to hit on spell attacks). The scorpion-snake can innately cast the following spells, requiring no material components:\n'b'\n'b'\n'b'  At will :  detect evil and good ,  detect magic  \n'b'  3/day each :  lightning bolt ,  wall of fire  \n'b'  1/day each :  harm ,  symbol  \n'b'\n'b'  Magic Resistance . The serpent of the Duat has advantage on saving throws against spells and other magical effects. \n'b'  Magic Weapons . The serpent of the Duat\xe2\x80\x99s weapon attacks are magical. \n'b'\n'b' ACTIONS \n'b'\n'b'  Multiattack . The serpent of the Duat makes one Bite attack, one Constrict attack, and one Sting attack. \n'b'  Bite .  Melee Weapon Attack : +14 to hit, reach 15 ft., one target.  Hit : 24 (3d10 + 8) piercing damage. If the target is a creature, it is  grappled  (escape DC 18). Until this grapple ends, the target is  restrained , and the serpent of the Duat can\xe2\x80\x99t bite another target. \n'b'  Constrict .  Melee Weapon Attack : +14 to hit, reach 20 ft., one target.  Hit : 19 (2d10 + 8) bludgeoning damage, and the target is  grappled  (escape DC 18). Until this grapple ends, the creature is  restrained , and the serpent of the Duat can\xe2\x80\x99t constrict another target. \n'b'  Kick .  Melee Weapon Attack : +14 to hit, reach 5 ft., one target that is not  grappled  by the serpent of the Duat.  Hit : 11 (1d6 + 8) bludgeoning damage. \n'b'  Sting .  Melee Weapon Attack : +14 to hit, range 20 ft., one target.  Hit : 13 (1d10 + 8) piercing damage, and the target must make a DC 19  Constitution  saving throw, taking 33 (6d10) poison damage on a failure or half as much on a success. \n'b'  Swallow . The serpent of the Duat makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, that creature takes the bite\xe2\x80\x99s damage and is swallowed, and the grapple ends. While swallowed, the creature is  blinded  and  restrained , it has total  cover  against attacks and other effects outside the serpent of the Duat, and it takes 35 (10d6) acid damage at the start of each of the serpent of the Duat\xe2\x80\x99s turns. If the serpent of the Duat takes 50 damage or more on a single turn from a creature inside it, the serpent of the Duat must succeed on a DC 15  Constitution  saving throw at the end of that turn or regurgitate all swallowed creatures that then fall  prone  in a space within 15 feet of the serpent of the Duat. If the serpent of the Duat dies, a swallowed creature is no longer  restrained  by it and can escape from the corpse using 20 feet of movement, exiting  prone . \n'b'  Fire Breath (Recharge 5-6) . The serpent of the Duat exhales fire in a 60-foot cone. Each creature in that area must make a DC 19  Dexterity  saving throw taking 56 (16d6) fire damage on a failure, or half as much on a success. \n'b'\n'b' LEGENDARY ACTIONS \n'b' The serpent of the Duat can take three 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 serpent of the Duat regains spent legendary actions at the start of its turn. \n'b'\n'b'  Bite (costs 2 Actions) . The serpent of the Duat makes a Bite  attack . \n'b'  Kick . The serpent of the Duat makes a Kick attack. \n'b'  Move . The serpent of the Duat moves up to its speed without provoking opportunity attacks. \n'b'\n'b' ABOUT \n'b' A serpent of this sort, a major one, is a very nasty thing indeed. The serpent\xe2\x80\x99s head resembles a cross between a snake\xe2\x80\x99s and crocodile\xe2\x80\x99s, with long front fangs as a snake and rows of lesser teeth besides. The creature has an ophidian body some 64 feet long, about four feet in diameter at its thickest part. Set along the middle third of its body \xe2\x80\x93 the thickest portion \xe2\x80\x93 are three pairs of legs of the sort that enable the serpent to move at either a sprawling or erect gait, or slither noiselessly along. It has wings but does not actually use them to fly (relying on its magic instead).'