b'Perpetual Engine \n'b'  Gargantuan   mythic construct ,  lawful evil  \n'b'  Armor Class  30 (natural armor)  Hit Points  315 (18d20 + 126)  Speed  40 ft.\n'b' STATS STR: 30 (+10) DEX:  4 (-3)  CON:  24 (+7)  INT:  14 (+2)  WIS:  21 (+5)  CHA:  1 (-5)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Saving Throws   Str  +20,  Dex  +7,  Con  +17,  Int  +12,  Wis  +15,  Cha  +5  Skills   Perception  +25  Damage Resistances  bludgeoning, piercing, and slashing from non-Epic creatures  Damage Immunities  poison, psychic  Condition Immunities   charmed ,  frightened ,  stunned ,  unconscious   Senses   darkvision  500 ft., passive  Perception  35  Languages  Binary  Challenge  Mythic 4 \n'b' SPECIAL TRAITS \n'b'\n'b'  Advanced Weaponry . The engine\xe2\x80\x99s attacks are magical and have a +3 bonus to  attack  and  damage rolls  (included in their description). \n'b'  Arcane Dynamo . When the engine is affected by a non-Epic spell, that spell\xe2\x80\x99s caster must succeed on a DC 24  Intelligence ,  Wisdom , or  Charisma  saving throw (caster\xe2\x80\x99s choice) or the spell fails and is absorbed by the engine. When the engine absorbs a spell in this manner, it deals additional arcane damage on the next successful  attack  it makes. This benefit is cumulative and lasts until the start of the engine\xe2\x80\x99s next turn. The additional damage is 1d6 for a cantrip or 1st-level spell, plus 1d6 for each spell level above 1st. \n'b'  Mythic Resistance . When the engine fails a saving throw, it can expend one of its unspent legendary actions to succeed instead. \n'b'  Reconstruction Protocol . The engine is extraordinarily difficult to permanently damage. When the engine is reduced to  0 hit points , it is instead restored to its hit point maximum and gains one level of the damaged condition. If the engine starts its turn and has six or more levels of the damaged condition, it is slain. Additionally, the engine is immune to effects that would kill or destroy it (such as  disintegrate  or  power word kill ) so long as it has five or fewer levels of the damaged condition. \n'b'\n'b' MYTHIC ACTIONS \n'b' On  initiative  count 20 (losing  initiative  ties), the engine takes a mythic action to cause one of the following effects. The engine cannot cause the same effect twice in a row. \n'b'\n'b'  Lock On . The engine targets a creature it can see with its weaponry. Until the next  initiative  count 20 the target cannot be hidden or  invisible  from the engine, and the engine\xe2\x80\x99s attacks score a critical hit on an attack roll of 16-20. Additionally, the engine cannot  attack  another creature unless it is unable to  attack  its target. \n'b'  Radiation Cloud . The engine emits of cloud of magical toxins in a 120-foot-radius sphere. Until the next  initiative  count 20 the area is heavily obscured, and creatures in the area have disadvantage on  Intelligence ,  Wisdom , and  Charisma  saving throws. \n'b'\n'b' ACTIONS \n'b'\n'b'  Multiattack . The engine makes two Cataclysm Rocket or Pound attacks and either uses Acid Sprayer, Booster Engines, Lightning Harpoon, Power Slam, or Sonic Cannon action. \n'b'  Acid Sprayer . The engine sprays poisonous acid in a 30-foot cone. Each creature in the area must succeed on a DC 24  Constitution  saving throw or take 54 (12d8) acid damage and become  poisoned . Additionally, the ground in the affected area becomes  difficult terrain  unless it is immune to acid damage. \n'b'  Booster Engines . The engine gains a fly speed of 90 feet until the end of its next turn. \n'b'  Cataclysm Rocket .  Ranged Weapon Attack : +10 to hit, range 1,000 ft., each target in a 25-ft. cube the engine can see.  Hit : 25 (4d10 + 3) fire damage. \n'b'  Lightning Harpoon .  Ranged Spell Attack : +15 to hit, range 120 ft., one creature.  Hit : 31 (4d12 + 5) lightning damage, and the target is impaled by a harpoon on the end of a long chain. A creature so impaled cannot move or be moved away from the engine (including via magical teleportation). Additionally, at the end of each of its turns a creature so impaled takes 31 (4d12 + 5) lightning damage and is pulled 30 feet toward the engine. A creature can remove the harpoon by taking an action to succeed on a DC 24  Strength  ( Athletics ) check. If the creature is ever more than 120 feet away from the engine, the impalement ends. \n'b'  Pound .  Melee Weapon Attack : +23 to hit, reach 15 ft., one target.  Hit : 40 (6d8 + 13) bludgeoning damage. \n'b'  Power Slam . The engine moves up to double its speed in a straight line. If the engine would move into a creature\xe2\x80\x99s space as a part of this movement, the creature must attempt a DC 24  Dexterity  saving throw. On a success, the creature moves to the nearest unoccupied space out of the path of engine. On a failure, the creature is pushed ahead of the engine as it travels, takes 35 (10d6) bludgeoning damage, and is  stunned  until the start of its next turn. If the engine encounters an object that would prevent the movement from this action, the object takes 70 (20d6) bludgeoning damage. If this damage destroys the object, the engine continues on its path. \n'b'  Rapid Repair (Recharge 6) . The engine magically regains  hit points  equal to its hit point maximum. \n'b'  Sonic Cannon . The engine fires a line of concentrated sound in a 300 ft. line that is 5 ft. wide. Creatures in the affected area must succeed on a DC 24  Constitution  saving throw or take 55 (10d10) thunder damage and be  deafened . A successful save halves the damage and prevents being  deafened . \n'b'\n'b' LEGENDARY ACTIONS \n'b' The engine 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 engine regains spent legendary actions at the start of its turn. \n'b'\n'b'  Advanced Weaponry (Costs 2 Actions) . The engine uses its Acid Sprayer, Booster Engines, Lightning Harpoon, Power Slam, or Sonic Cannon action. \n'b'  Assault . The engine makes a Cataclysm Rocket or Pound attack. \n'b'  Dispelling Burst . The engine ends any non-Epic spells or magical effects within a 10-foot-radius sphere centered on it. \n'b'  Reengage . The engine moves up to its speed.'