b'Necrorune Bulette \n'b'  Family:   Bulette  \n'b'  Large   construct ,  unaligned  \n'b'  Armor Class  18 (natural armor) \n'b' Hit Points  126 (12d10 + 60) \n'b' Speed  40 ft., burrow 40 ft.\n'b' STATS STR: 21 (+5) DEX:  10 (+0)  CON:  20 (+5)  INT:  2 (-4)  WIS:  13 (+1)  CHA:  5 (-3)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Skills   Perception  +7 \n'b' Damage Immunities  necrotic, poison, psychic \n'b' Condition Immunities   charmed ,  exhaustion ,  frightened ,  paralyzed ,  petrified ,  poisoned  \n'b' Senses  tremorsense 60 ft., passive  Perception  17 \n'b' Languages  understands the languages of its creator but can\xe2\x80\x99t speak \n'b' Challenge  8 (3,900 XP) \n'b' Proficiency Bonus  +3 \n'b' SPECIAL TRAITS \n'b'\n'b'  Explosive Malfunction . Whenever the bulette takes 20 damage or more from a single source, each creature within 5 feet of it must succeed on a DC 16  Dexterity  saving throw or take 10 (3d6) piercing damage. The first time this happens, the bulette loses its tremorsense. The second time, its speed is halved. The third time, it can no longer take bonus  actions . \n'b'  Immutable Form . The bulette is immune to any spell or effect that would alter its form. \n'b'  Tunneler . The bulette can burrow through solid rock at half its burrowing speed and leaves a 10-foot-diameter tunnel in its wake. \n'b'\n'b' ACTIONS \n'b'\n'b'  Bite .  Melee Weapon Attack : +8 to hit, reach 5 ft., one target.  Hit : 31 (4d12 + 5) piercing damage plus 9 (2d8) necrotic damage. \n'b'  Shadow Glide . The bulette becomes heavily obscured by magical  darkness  and moves up to its speed in a straight line. While moving in this way, the bulette can move through the space of any Large or smaller creature. Whenever it enters a creature\xe2\x80\x99s space for the first time during this move, that creature must make a DC 16  Constitution  saving throw. On a failed save, the creature takes 18 (4d8) necrotic damage and is  blinded  until the start of the bulette\xe2\x80\x99s next turn. On a successful one, it takes half as much damage and isn\xe2\x80\x99t  blinded . \n'b'  Corrupting Gas (Recharge 5 6) . The bulette exhales gas in a 30-foot cone. Each creature in that area must make a DC 16  Intelligence  saving throw. A creature automatically succeeds if it is immune to being  frightened . On a failed save, a creature loses the ability to distinguish friend from foe and regards all creatures as enemies for 1 minute. It must  attack  the creature closest to it that it can see to the best of its ability, choosing its target at random if multiple creatures are within range. The creature can repeat the saving throw at the end of each of its turns and each time it takes damage, ending the effect on itself on a success. \n'b'\n'b' BONUS ACTIONS \n'b'\n'b'  Arms of  Darkness  . Dark tendrils erupt from the bulette. Each creature within 15 feet of it must make a DC 16  Strength  saving throw. On a failed save, a target takes 7 (2d6) necrotic damage, is pulled up to 10 feet toward the bulette, and is  grappled  (escape DC 15) until the end of the bulette\xe2\x80\x99s next turn. \n'b'  Runic Magic . The bulette activates the runes engraved on it to gain one of the following benefits that last until it uses this action again:\n'b'\n'b' A creature that touches the bulette or hits it with a  melee attack  while within 5 feet of it must succeed on a DC 16  Dexterity  saving throw or take 7 (2d6) necrotic damage. \n'b' A creature that starts its turn within 5 feet of the bulette or moves there for the first time on its turn must succeed on a DC 16  Charisma  saving throw or subtract a d4 from all  attack  rolls and saving throws it makes until the end of its next turn. \n'b' When the bulette deals damage to a creature, that creature can\xe2\x80\x99t regain  hit points  until the start of the bulette\xe2\x80\x99s next turn. \n'b'\n'b' ABOUT \n'b' Plated in a mixture of adamantine and steel infused with deadly magical runes, the necrorune bulette is a dark and dangerous construct. \n'b' Often carved to dig and clear tunnels and keep them clear of living inhabitants digging through solid stone is far from the only thing a necrorune bulette is capable of. The glowing green runes etched onto its armor allows the construct to draw upon dark magical energy to  shroud  itself in sickening necrotic  darkness  or turn friends into foes as it exhales its maddening gas.'