Hellfire Engine

CreatureMPMMp. 1522014

Huge construct, lawful evil

Armor Class
18 (natural armor)
Hit Points
216 (16d12 + 112)
Speed
40 ft.
Challenge
16 (15,000 XP)
STR
20
+5
DEX
16
+3
CON
24
+7
INT
2
-4
WIS
10
+0
CHA
1
-5
Saving Throws
Cha +0, Dex +8, Wis +5
Damage Resistances
cold; psychic; bludgeoning, piercing, slashing from nonmagical attacks that aren't silvered
Damage Immunities
fire; poison
Condition Immunities
charmed; deafened; exhaustion; frightened; paralyzed; poisoned; unconscious
Senses
darkvision 120 ft., passive Perception 10
Languages
understands Infernal but can't speak

Traits

Immutable Form.

The hellfire engine is immune to any spell or effect that would alter its form.

Magic Resistance.

The hellfire engine has advantage on saving throws against spells and other magical effects.

Unusual Nature.

The hellfire engine doesn't require air, food, drink, or sleep.

Actions

Flesh-Crushing Stride.

The hellfire engine moves up to its speed in a straight line. During this move, it can enter Large or smaller creatures' spaces. A creature whose space the hellfire engine enters must make a DC 18 Dexterity saving throw. On a successful save, the creature is pushed to the nearest space out of the hellfire engine's path. On a failed save, the creature falls prone and takes 28 (8d6) bludgeoning damage.

If the hellfire engine remains in the prone creature's space, the creature is also restrained until it's no longer in the same space as the hellfire engine. While restrained in this way, the creature, or another creature within 5 feet of it, can make a DC 18 Strength check. On a success, the creature is shunted to an unoccupied space of its choice within 5 feet of the hellfire engine and is no longer restrained.

Hellfire Weapons.

The hellfire engine uses one of the following options (choose one or roll a d6):

  • 1โ€“2: Bonemelt Sprayer. The hellfire engine spews acidic flame in a 60-foot cone. Each creature in the cone must make a DC 20 Dexterity saving throw, taking 11 (2d10) fire damage plus 18 (4d8) acid damage on a failed save, or half as much damage on a successful one. Creatures that fail the saving throw are drenched in burning acid and take 5 (1d10) fire damage plus 9 (2d8) acid damage at the end of their turns. An affected creature or another creature within 5 feet of it can take an action to scrape off the burning fuel.
  • 3โ€“4: Lightning Flail. Melee Weapon Attack: +10 to hit, reach 15 ft., one creature. Hit: 18 (3d8 + 5) bludgeoning damage plus 22 (5d8) lightning damage. Up to three other creatures of the hellfire engine's choice that it can see within 30 feet of the target must each make a DC 20 Dexterity saving throw, taking 22 (5d8) lightning damage on a failed save, or half as much damage on a successful one.
  • 5โ€“6: Thunder Cannon. The hellfire engine targets a point within 120 feet of it that it can see. Each creature within 30 feet of that point must make a DC 20 Dexterity saving throw, taking 27 (5d10) bludgeoning damage plus 19 (3d12) thunder damage on a failed save, or half as much damage on a successful one.If the chosen option kills a creature, the creature's soul rises from the River Styx as a lemure in Avernus in 1d4 hours. If the creature isn't revived before then, only a wish spell or killing the lemure and casting true resurrection on the creature's original body can restore it to life. Constructs and devils are immune to this effect.
Raw data
{
  "ac": [
    {
      "ac": 18,
      "from": [
        "natural armor"
      ]
    }
  ],
  "cr": "16",
  "hp": {
    "average": 216,
    "formula": "16d12 + 112"
  },
  "cha": 1,
  "con": 24,
  "dex": 16,
  "int": 2,
  "str": 20,
  "wis": 10,
  "name": "Hellfire Engine",
  "page": 152,
  "save": {
    "cha": "+0",
    "dex": "+8",
    "wis": "+5"
  },
  "size": [
    "H"
  ],
  "type": "construct",
  "speed": {
    "walk": 40
  },
  "trait": [
    {
      "name": "Immutable Form",
      "entries": [
        "The hellfire engine is immune to any spell or effect that would alter its form."
      ]
    },
    {
      "name": "Magic Resistance",
      "entries": [
        "The hellfire engine has advantage on saving throws against spells and other magical effects."
      ]
    },
    {
      "name": "Unusual Nature",
      "entries": [
        "The hellfire engine doesn't require air, food, drink, or sleep."
      ]
    }
  ],
  "__prop": "monster",
  "action": [
    {
      "name": "Flesh-Crushing Stride",
      "entries": [
        "The hellfire engine moves up to its speed in a straight line. During this move, it can enter Large or smaller creatures' spaces. A creature whose space the hellfire engine enters must make a {@dc 18} Dexterity saving throw. On a successful save, the creature is pushed to the nearest space out of the hellfire engine's path. On a failed save, the creature falls {@condition prone} and takes 28 ({@damage 8d6}) bludgeoning damage.",
        "If the hellfire engine remains in the {@condition prone} creature's space, the creature is also {@condition restrained} until it's no longer in the same space as the hellfire engine. While {@condition restrained} in this way, the creature, or another creature within 5 feet of it, can make a {@dc 18} Strength check. On a success, the creature is shunted to an unoccupied space of its choice within 5 feet of the hellfire engine and is no longer {@condition restrained}."
      ]
    },
    {
      "name": "Hellfire Weapons",
      "entries": [
        "The hellfire engine uses one of the following options (choose one or roll a {@dice d6}):",
        {
          "type": "list",
          "items": [
            {
              "name": "1โ€“2: Bonemelt Sprayer",
              "type": "item",
              "entries": [
                "The hellfire engine spews acidic flame in a 60-foot cone. Each creature in the cone must make a {@dc 20} Dexterity saving throw, taking 11 ({@damage 2d10}) fire damage plus 18 ({@damage 4d8}) acid damage on a failed save, or half as much damage on a successful one. Creatures that fail the saving throw are drenched in burning acid and take 5 ({@damage 1d10}) fire damage plus 9 ({@damage 2d8}) acid damage at the end of their turns. An affected creature or another creature within 5 feet of it can take an action to scrape off the burning fuel."
              ]
            },
            {
              "name": "3โ€“4: Lightning Flail",
              "type": "item",
              "entries": [
                "{@atk mw} {@hit 10} to hit, reach 15 ft., one creature. {@h}18 ({@damage 3d8 + 5}) bludgeoning damage plus 22 ({@damage 5d8}) lightning damage. Up to three other creatures of the hellfire engine's choice that it can see within 30 feet of the target must each make a {@dc 20} Dexterity saving throw, taking 22 ({@damage 5d8}) lightning damage on a failed save, or half as much damage on a successful one."
              ]
            },
            {
              "name": "5โ€“6: Thunder Cannon",
              "type": "item",
              "entries": [
                "The hellfire engine targets a point within 120 feet of it that it can see. Each creature within 30 feet of that point must make a {@dc 20} Dexterity saving throw, taking 27 ({@damage 5d10}) bludgeoning damage plus 19 ({@damage 3d12}) thunder damage on a failed save, or half as much damage on a successful one.",
                "If the chosen option kills a creature, the creature's soul rises from the River Styx as a {@creature lemure} in Avernus in {@dice 1d4} hours. If the creature isn't revived before then, only a {@spell wish} spell or killing the {@creature lemure} and casting true resurrection on the creature's original body can restore it to life. Constructs and devils are immune to this effect."
              ]
            }
          ],
          "style": "list-hang-notitle"
        }
      ]
    }
  ],
  "immune": [
    "fire",
    "poison"
  ],
  "resist": [
    "cold",
    "psychic",
    {
      "cond": true,
      "note": "from nonmagical attacks that aren't silvered",
      "resist": [
        "bludgeoning",
        "piercing",
        "slashing"
      ]
    }
  ],
  "senses": [
    "darkvision 120 ft."
  ],
  "source": "MPMM",
  "passive": 10,
  "hasFluff": true,
  "hasToken": true,
  "miscTags": [
    "AOE",
    "RCH"
  ],
  "alignment": [
    "L",
    "E"
  ],
  "languages": [
    "understands Infernal but can't speak"
  ],
  "senseTags": [
    "SD"
  ],
  "soundClip": {
    "path": "bestiary/hellfire-engine.opus",
    "type": "internal"
  },
  "traitTags": [
    "Immutable Form",
    "Magic Resistance",
    "Unusual Nature"
  ],
  "damageTags": [
    "A",
    "B",
    "F",
    "L",
    "T"
  ],
  "languageTags": [
    "CS",
    "I"
  ],
  "otherSources": [
    {
      "page": 165,
      "source": "MTF"
    }
  ],
  "hasFluffImages": true,
  "alignmentPrefix": "Typically ",
  "conditionImmune": [
    "charmed",
    "deafened",
    "exhaustion",
    "frightened",
    "paralyzed",
    "poisoned",
    "unconscious"
  ],
  "conditionInflict": [
    "prone",
    "restrained"
  ],
  "savingThrowForced": [
    "dexterity"
  ]
}
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