b'Yrth \n'b'  Large   beast ,  neutral evil  \n'b'  Armor Class  16 (natural armor)  Hit Points  97 (15d10+15)  Speed  fly 60 ft.\n'b' STATS STR: 17 (+3) DEX:  13 (+1)  CON:  12 (+1)  INT:  7 (-2)  WIS:  10 (+0)  CHA:  6 (-2)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Skills   Stealth  +4  Condition Immunities   blinded ,  Petrified ,  prone   Damage Resistances  lightning  Senses  tremorsense 60 ft.  Challenge  6 (2300 XP) \n'b' SPECIAL TRAITS \n'b'\n'b'  Passwall . The yrth can cast  passwall  at will as an action. \n'b'  Camouflage . The yrth naturally blends into any stone around it, giving it advantage on all  Stealth  checks. \n'b'\n'b' ACTIONS \n'b'\n'b'  Multiattack . The yrth can strike twice with its tentacles, and then once with its bite. \n'b'  Tentacle .  Melee Weapon Attack : +6 to hit, reach 15 ft., one creature.  Hit : 10 (2d6+3) bludgeoning damage. The target must also make a  Dexterity  save (DC 15), taking 17 (5d6) lightning damage on a failed save, or half as much on a success. \n'b'  Bite .  Melee Weapon Attack : +6 to hit, reach 5 ft., one target.  Hit : 16 (2d12+3) piercing damage. \n'b'\n'b' ABOUT \n'b' The yrth are creatures that dwell underground. They are long, flat, and wide with huge heads. Sores of fangs fill their wide jaws, these fangs never quite fit into the mouth when it\xe2\x80\x99s closed. \n'b' Hard skin around the mouth bears the marks of their own teeth-ruts, carved from years of holding their jaws clamped shut. Long tendrils hang around the beast\xe2\x80\x99s mouth; they are constantly moving, gyrating in the air before the creature. Along their back is a low ridge of flat bone that continues to the end of the beast\xe2\x80\x99s tail. The tail itself sports a large, horizontal fin that provides the creature with its forward motion. The yrth have no eyes or nose. \n'b'  Fly through Stone . The yrth are strange creatures that swim through the air as a fish does water. They rarely touch the ground. They move from cavern to cavern through an innate passwall ability, spending their entire lives in darkness. They feel their way through a host of small pits lining their head and along the boney apertures along their flanks. These serve as very primitive sonar similar to the bats. \n'b'  Territorial . The yrth find a habitable den and nest there until forced out or slain. Their dens usually consist of fissures or holes beneath ledges, rocks, or outcroppings. They spend much of their lives in a dormant state, without the need of any nourishment. But they do not sleep and are constantly aware of what is going on around them. \n'b'  Ambush . The yrth attack any potential prey that passes in front of their den. They begin their attack by whipping a tendril out to strike the prey with the electrical shock. They quickly follow the shock attack by lunging from their den and delivering a nasty bite. They continue to shock and bite until the prey is dead at which point they drag it into the den and devour it.'