b'Sathaq Worm \n'b'  Huge   elemental ,  neutral evil  \n'b'  Armor Class  16 (natural armor)  Hit Points  149 (13d12 + 65)  Speed  20 ft., burrow 40 ft.\n'b' STATS STR: 22 (+6) DEX:  6 (-2)  CON:  20 (+5)  INT:  5 (-3)  WIS:  12 (+1)  CHA:  9 (-1)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Skills   Perception  +5,  Stealth  +2  Damage Resistances  bludgeoning, piercing, and slashing from nonmagical attacks  Damage Immunities  acid, poison  Condition Immunities   exhaustion ,  paralyzed ,  petrified ,  poisoned   Senses  tremorsense 60 ft., passive  Perception  15  Languages  understands Deep Speech and Terran but can\xe2\x80\x99t speak  Challenge  10 (5,900 XP)  Proficiency Bonus  +4 \n'b' SPECIAL TRAITS \n'b'\n'b'  Agonizing Aura . The sathaq worm emits ultrasonic noise and minor vibrations that cause pain and subtly disrupt the functions of most creatures. A creature that starts its turn within 15 feet of the sathaq worm must succeed on a DC 17  Constitution  saving throw or have disadvantage on  attack  rolls until the start of its next turn. Creatures with  resistance  or immunity to thunder damage automatically succeed on the saving throw. \n'b'  Earth Glide . The sathaq worm can burrow through nonmagical, unworked earth and stone. While doing so, the worm doesn\xe2\x80\x99t disturb the material it moves through. \n'b'  Earthen Camouflage . The sathaq worm has advantage on  Dexterity  (Stealth) checks made to  hide  in sandy, muddy, or rocky terrain. \n'b'  Siege Monster . The sathaq worm deals double damage to objects and structures. \n'b'\n'b' ACTIONS \n'b'\n'b'  Multiattack . The sathaq worm makes one Bite attack and two Slam attacks, or it makes three Slam attacks. It can replace its Bite attack with a use of Swallow. \n'b'  Bite .  Melee Weapon Attack : +10 to hit, reach 10 ft., one target.  Hit : 24 (4d8 + 6) piercing damage, and the target is  grappled  (escape DC 17). Until this grapple ends, the target is  restrained , and the sathaq worm can\xe2\x80\x99t Bite another target. \n'b'  Slam .  Melee Weapon Attack : +10 to hit, reach 10 ft., one target.  Hit : 19 (3d8 + 6) bludgeoning damage. \n'b'  Swallow . The sathaq worm makes one Bite  attack  against a Large or smaller creature 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 worm (including the worm\xe2\x80\x99s Agonizing Aura), and takes 10 (3d6) piercing damage and 10 (3d6) acid damage at the start of each of the sathaq worm\xe2\x80\x99s turns. The sathaq worm can have only one creature swallowed at a time. If the sathaq worm takes 30 damage or more on a single turn from the swallowed creature, the sathaq worm must succeed on a DC 15  Constitution  saving throw at the end of that turn or regurgitate the creature, which falls  prone  in a space within 5 feet of the sathaq worm. If the sathaq worm dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 10 feet of movement, exiting  prone . \n'b'\n'b' ABOUT \n'b' This titanic worm\xe2\x80\x99s rocky hide is rough and hard as stone. Its yawning gullet writhes with miniature worms like itself. \n'b'  Elemental Predators . Sathaq worms are nightmarish predators from the Plane of Elemental Earth with rugged brown hide embedded with stones. They devour stone and flesh with equal ease. \n'b'  Guts Filled with Larvae . Sathaq worms are solitary; they approach each other only to mate. Their young incubate inside the worms\xe2\x80\x99 gullets. Creatures they swallow are simultaneously digested by the parent worm and devoured by the larvae. \n'b'  Painful Presence . Ultrasonic noise and magical ripples that tear at flesh and bone make the very presence of a sathaq worm extremely uncomfortable for creatures of the Material Plane.'