Olhydra

{
  "ac": [
    {
      "ac": 18,
      "from": [
        "natural armor"
      ]
    }
  ],
  "cr": "18",
  "hp": {
    "average": 324,
    "formula": "24d12 + 168"
  },
  "cha": 23,
  "con": 24,
  "dex": 22,
  "int": 17,
  "str": 21,
  "wis": 18,
  "name": "Olhydra",
  "page": 218,
  "save": {
    "con": "+13",
    "str": "+11",
    "wis": "+10"
  },
  "size": [
    "H"
  ],
  "type": "elemental",
  "isNpc": true,
  "speed": {
    "swim": 100,
    "walk": 50
  },
  "trait": [
    {
      "name": "Empowered Attacks",
      "entries": [
        "Olhydra's slam attacks are treated as magical for the purpose of bypassing resistance and immunity to nonmagical attacks."
      ]
    },
    {
      "name": "Legendary Resistance (3/Day)",
      "entries": [
        "If Olhydra fails a saving throw, she can choose to succeed instead."
      ]
    },
    {
      "name": "Magic Resistance",
      "entries": [
        "Olhydra has advantage on saving throws against spells and other magical effects."
      ]
    },
    {
      "name": "Water Form",
      "entries": [
        "Olhydra can enter a hostile creature's space and stop there. She can move through a space as narrow as 1 inch wide without squeezing."
      ]
    }
  ],
  "__prop": "monster",
  "action": [
    {
      "name": "Multiattack",
      "entries": [
        "Olhydra makes two slam attacks or two water jet attacks."
      ]
    },
    {
      "name": "Slam",
      "entries": [
        "{@atk mw} {@hit 11} to hit, reach 10 ft., one target. {@h}21 ({@damage 3d10 + 5}) bludgeoning damage, and the target is {@condition grappled} (escape {@dc 19}). Olhydra can grapple up to four targets. When Olhydra moves, all creatures she is grappling move with her."
      ]
    },
    {
      "name": "Water Jet",
      "entries": [
        "{@atk rw} {@hit 12} to hit, range 120 ft., one target. {@h}21 ({@damage 6d6}) bludgeoning damage, and the target is knocked {@condition prone} if it fails a {@dc 19} Strength saving throw."
      ]
    },
    {
      "name": "Summon Elementals (1/Day)",
      "entries": [
        "Olhydra summons up to three {@creature water elemental||water elementals} and loses 30 hit points for each elemental she summons. Summoned elementals have maximum hit points, appear within 100 feet of Olhydra, and disappear if Olhydra is reduced to 0 hit points."
      ]
    }
  ],
  "immune": [
    "acid",
    "cold",
    "poison"
  ],
  "resist": [
    "lightning",
    {
      "cond": true,
      "note": "from nonmagical attacks",
      "resist": [
        "bludgeoning",
        "piercing",
        "slashing"
      ]
    }
  ],
  "senses": [
    "blindsight 120 ft."
  ],
  "source": "PotA",
  "passive": 14,
  "hasFluff": true,
  "hasToken": true,
  "miscTags": [
    "MW",
    "RCH",
    "RW"
  ],
  "alignment": [
    "N",
    "E"
  ],
  "languages": [
    "Aquan"
  ],
  "legendary": [
    {
      "name": "Crush",
      "entries": [
        "One creature that Olhydra is grappling is crushed for 21 ({@damage 3d10 + 5}) bludgeoning damage."
      ]
    },
    {
      "name": "Fling (Costs 2 Actions)",
      "entries": [
        "Olhydra releases one creature she is grappling by flinging the creature up to 60 feet away from her, in a direction of her choice. If the flung creature comes into contact with a solid surface, such as a wall or floor, the creature takes {@damage 1d6} bludgeoning damage for every 10 feet it was flung."
      ]
    },
    {
      "name": "Water to Acid (Costs 3 Actions)",
      "entries": [
        "Olhydra transforms her watery body into acid. This effect lasts until Olhydra's next turn. Any creature that comes into contact with Olhydra or hits her with a melee attack while standing within 5 feet of her takes 11 ({@damage 2d10}) acid damage. Any creature {@condition grappled} by Olhydra takes 22 ({@damage 4d10}) acid damage at the start of its turn."
      ]
    }
  ],
  "senseTags": [
    "B"
  ],
  "traitTags": [
    "Legendary Resistances",
    "Magic Resistance"
  ],
  "actionTags": [
    "Multiattack"
  ],
  "damageTags": [
    "A",
    "B"
  ],
  "languageTags": [
    "AQ"
  ],
  "spellcasting": [
    {
      "name": "Innate Spellcasting",
      "type": "spellcasting",
      "will": [
        "{@spell wall of ice}"
      ],
      "daily": {
        "1": [
          "{@spell storm of vengeance}"
        ],
        "3": [
          "{@spell ice storm}"
        ]
      },
      "ability": "cha",
      "headerEntries": [
        "Olhydra's innate spellcasting ability is Charisma (spell save {@dc 20}, {@hit 12} to hit with spell attacks). She can innately cast the following spells, requiring no material components:"
      ]
    }
  ],
  "hasFluffImages": true,
  "legendaryGroup": {
    "name": "Olhydra",
    "source": "PotA"
  },
  "conditionImmune": [
    "charmed",
    "frightened",
    "paralyzed",
    "petrified",
    "poisoned",
    "prone",
    "restrained"
  ],
  "damageTagsSpell": [
    "A",
    "B",
    "C",
    "L",
    "T"
  ],
  "isNamedCreature": true,
  "conditionInflict": [
    "grappled",
    "prone"
  ],
  "spellcastingTags": [
    "I"
  ],
  "savingThrowForced": [
    "strength"
  ],
  "damageTagsLegendary": [
    "C"
  ],
  "conditionInflictSpell": [
    "deafened"
  ],
  "savingThrowForcedSpell": [
    "constitution",
    "dexterity"
  ],
  "conditionInflictLegendary": [
    "frightened",
    "prone"
  ],
  "savingThrowForcedLegendary": [
    "strength",
    "wisdom"
  ]
}