b'Mindwyrm \n'b'  Gargantuan   dragon ,  neutral evil  \n'b'  Armor Class  19 (natural armor)  Hit Points  332 (19d20 + 133)  Speed  60 ft., fly 80 ft.\n'b' STATS STR: 27 (+8) DEX:  14 (+2)  CON:  25 (+7)  INT:  16 (+3)  WIS:  13 (+1)  CHA:  21 (+5)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Saves   Dex  +6,  Con  +13,  Wis  +7,  Cha  +11  Skills   Deception  +17,  Perception  +13,  Stealth  +6  Damage Immunities  acid  Condition Immunities   charmed ,  paralyzed   Senses  blindsight 60 ft.,  darkvision  120 ft., passive  Perception   Languages  Abyssal, Aklo, Common, Draconic, Dreamspeak, Giant  Challenge  18 (20,000 XP) \n'b' SPECIAL TRAITS \n'b'\n'b'  Innate Spellcasting . (Psionic). The dragon\xe2\x80\x99s innate spellcasting ability is  Charisma  (spell save 19, +11 to hit with spell attacks). The dragon can innately manifest the following spells, requiring no material components:\n'b'\n'b'\n'b'  At will :  charm person ,  command ,  detect thoughts ,  prestidigitation ,  sleep ,  true strike , vicious mockery \n'b'  3/day each :  dominate person ,  fireball ,  dimension door ,  sleep  (4th level) \n'b'  1/day each :  comprehend languages ,  dream ,  dominate monster ,  feeblemind ,  mirror image ,  sleep  (9th level),  stoneskin ,  tongues ,  weird  \n'b'\n'b'  Dreamsight . The dragon can see the dreams of sleeping creatures. \n'b'  Dream Terror . The dragon can utterly control any dreamscape it enters, shaping it to its will. When a creature\xe2\x80\x99s lucid body dies in a dreamscape under the great wyrm\xe2\x80\x99s control, that creature\xe2\x80\x99s material body also dies. Also, magic can\xe2\x80\x99t put the dragon to sleep. \n'b'  Legendary Resistance (3/Day) . If the dragon fails a saving throw, it can choose to succeed instead. \n'b'  Maximize Magic (3/Day) . The dragon can use a bonus action when casting a spell of 3rd level or lower, causing that spell to have maximum effect. Any variable numeric effect of the spell is treated as the maximum result on the die roll. \n'b'  Psychic Mastery . The mindwyrm has advantage on saving throws against all mental, psionic, or mind-affecting effects and on  Intelligence  ( Arcana ) checks about mental, psychic, or mind-affecting magic or psionics. \n'b'  Traumatic Spellcaster . Each time a target fails a saving throw or takes damage from the dragon\xe2\x80\x99s spells it is affected by a dream spell. \n'b'\n'b' ACTIONS \n'b'\n'b'  Multiattack . The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws. \n'b'  Bite .  Melee Weapon Attack : +14 to hit, reach 10 ft., one target.  Hit : 19 (2d10 + 8) piercing damage plus 7 (2d6) fire damage. \n'b'  Nightmare Talons .  Melee Weapon Attack : +14 to hit, reach 5 ft., one target.  Hit : 15 (2d6 + 8) slashing damage. This attack scores a critical hit on a 19 or 20. \n'b'  Tail .  Melee Weapon Attack : +14 to hit, reach 15 ft., one target.  Hit : 17 (2d8 + 8) bludgeoning damage. \n'b'  Change Shape . The dragon magically polymorphs into a humanoid, or back into its true form. Other than its size, its statistics are the same in each form. The dragon\xe2\x80\x99s equipment transforms with him, which resizes appropriately. If the dragon dies, it reverts to its true form, and its equipment reverts to its normal size. \n'b'  Terrifying 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 19  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 or the effect ends for it, the creature is immune to the dragon\xe2\x80\x99s Frightful Presence for the next 24 hours. A creature that is  frightened  and fewer Hit Dice than the dragon, while  frightened , the target must take the  Dash  action and move away from the dragon by the safest available route on each of its turns, unless there is nowhere to move. If the creature ends its turn in a location where it doesn\xe2\x80\x99t have line of sight to the dragon, the creature can make a  Wisdom  saving throw. On a successful save, the  frightened  condition ends for that creature and it is immune to the dragon\xe2\x80\x99s Frightful Presence for the next 24 hours. \n'b'  Murky Acid Breath (Recharge 5\xe2\x80\x936) . The dragon exhales acid in a 90-foot line that is 10 feet wide. Each creature in that line must make a DC 22  Dexterity  saving throw, taking 67 (15d8) acid damage on a failed save, or half as much damage on a successful one. \n'b'\n'b' REACTIONS \n'b'\n'b'  Rising Nightmare . As a  reaction  to killing a living creature the dragon casts  phantasmal killer  which rises from the body of the creature it just killed. \n'b'\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'\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 10 feet of the dragon must succeed on a DC 22  Dexterity  saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked  prone . The dragon can then fly up to half its flying speed. \n'b'\n'b' LAIR ACTIONS \n'b' A mindwyrm sometimes lairs in the midst of great cities rife with the delicious dreams of the living, hiding itself within palaces of its servants and slaves, but more often they find comfort in ancient ruins where the lingering resonance of ancient thoughts and dreams lingers in their absence. \n'b' On initiative count 20 (losing  initiative  ties), the dragon takes a lair action to cause one of the following effects: \n'b'\n'b' The dragon creates fog as though it had cast the  fog cloud  spell. The fog lasts until initiative count 20 on the next round. \n'b' Dissonant whispers originate at a point the dragon can see within 120 feet of it. Each creature within a 20-foot radius centered on that point must make a DC 15  Constitution  saving throw or take 5 (1d10) psychic damage and the target must immediately use its  reaction , if available, to move its Speed away from the dragon. \n'b'\n'b' REGIONAL EFFECTS \n'b' The region containing a mindwyrm\xe2\x80\x99s lair is warped by the dragon\xe2\x80\x99s magic. If the dragon dies, changed weather reverts to normal, as described in the spell, and the other effects fade in 1d10 days. \n'b'\n'b' Once per day, the dragon can alter the weather in a 6-mile radius centered on its lair. The dragon doesn\xe2\x80\x99t need to be outdoors; otherwise, the effect is identical to the  control weather  spell. \n'b' The environment within 6 miles of the dragon\xe2\x80\x99s lair takes on dreamlike quality \xe2\x80\x93 especially at night \xe2\x80\x93 with plants gaining strange, brilliant, and luminescent hues. \n'b' Within its lair, the dragon can set illusory effects that mimic deja vu, such as soft music a creature heard as a child and strange echoes of a forgotten friend, so that they can be heard in various parts of the lair. \n'b'\n'b' ABOUT \n'b' Mindwyrms dwell in the Dimension of Dreams, straddling the border between dream and nightmare. They hunger for the mental musings of sleeping creatures but also seek to draw them across the threshold of reality to torment them in the darkest recesses of their own minds. Mindwyrms often make use of dreamscapes to test their foes and observe how they act in life-or-death situations. Those they find sufficiently intriguing they may visit in person, with generally fatal results. A mindwyrm is a huge creature over 40 feet long, but their bodies often appear shadowy and vague, with only their horn-crowned heads clearly visible, though their talons and tail are just as deadly as any other dragon\xe2\x80\x99s.'