Storm Giant Tempest Caller

{
  "ac": [
    {
      "ac": 17,
      "from": [
        "natural armor"
      ]
    }
  ],
  "cr": "20",
  "hp": {
    "average": 310,
    "formula": "27d12 + 135"
  },
  "cha": 25,
  "con": 20,
  "dex": 14,
  "int": 21,
  "str": 29,
  "wis": 18,
  "name": "Storm Giant Tempest Caller",
  "page": 182,
  "save": {
    "cha": "+13",
    "con": "+11",
    "str": "+15",
    "wis": "+10"
  },
  "size": [
    "H"
  ],
  "type": {
    "tags": [
      "sorcerer"
    ],
    "type": "giant"
  },
  "skill": {
    "arcana": "+17",
    "athletics": "+15",
    "perception": "+10"
  },
  "speed": {
    "fly": {
      "number": 50,
      "condition": "(hover)"
    },
    "swim": 50,
    "walk": 50,
    "canHover": true
  },
  "trait": [
    {
      "name": "Alert",
      "entries": [
        "The giant can't be surprised, and it has advantage on initiative rolls."
      ]
    },
    {
      "name": "Amphibious",
      "entries": [
        "The giant can breathe air and water."
      ]
    },
    {
      "name": "Legendary Resistance (3/Day)",
      "entries": [
        "If the giant fails a saving throw, it can choose to succeed instead."
      ]
    },
    {
      "name": "Scrying (Requires Storm Rune)",
      "entries": [
        "The giant can use its crystal ball to cast the {@spell scrying} spell (save {@dc 17})."
      ]
    },
    {
      "name": "Storm Rune",
      "entries": [
        "The giant has a storm rune inscribed on a crystal ball. While the object bearing the rune is embedded in its body, the giant can use its Tempest Call action and its Scrying trait.",
        "The object bearing the storm rune has AC 17; 50 hit points; and immunity to necrotic, poison, and psychic damage. The object regains all its hit points at the end of every turn, but it turns to dust if reduced to 0 hit points or when the giant dies. If the rune is destroyed, the giant can inscribe a storm rune on another crystal ball in its possession when it finishes a short or long rest."
      ]
    }
  ],
  "__prop": "monster",
  "action": [
    {
      "name": "Multiattack",
      "entries": [
        "The giant makes three Lightning Blade or Lightning Lance attacks."
      ]
    },
    {
      "name": "Lightning Blade",
      "entries": [
        "{@atk mw} {@hit 15} to hit, reach 10 ft., one target. {@h}22 ({@damage 3d8 + 9}) slashing damage plus 16 ({@damage 3d10}) lightning damage."
      ]
    },
    {
      "name": "Lightning Lance",
      "entries": [
        "{@atk rs} {@hit 13} to hit, range 500 ft., one target. {@h}39 ({@damage 5d12 + 7}) lightning damage."
      ]
    },
    {
      "name": "Tempest Call (Requires Storm Rune)",
      "entries": [
        "The giant creates an elemental vortex that fills a 60-foot-radius sphere centered on itself. Each creature in that area other than the giant must make a {@dc 21} Dexterity saving throw. On a failed save, a creature takes 43 ({@damage 8d8 + 7}) damage of a type of the giant's choosing: cold, lightning, or thunder. On a successful save, a creature takes half as much damage."
      ]
    }
  ],
  "immune": [
    "lightning",
    "thunder"
  ],
  "resist": [
    "cold"
  ],
  "senses": [
    "truesight 120 ft."
  ],
  "source": "BGG",
  "passive": 20,
  "hasFluff": true,
  "hasToken": true,
  "miscTags": [
    "AOE",
    "MW",
    "RCH"
  ],
  "alignment": [
    "A"
  ],
  "languages": [
    "Common",
    "Giant",
    "Primordial"
  ],
  "senseTags": [
    "U"
  ],
  "traitTags": [
    "Amphibious",
    "Legendary Resistances"
  ],
  "actionTags": [
    "Multiattack"
  ],
  "damageTags": [
    "L",
    "S"
  ],
  "initiative": {
    "advantageMode": "adv"
  },
  "languageTags": [
    "C",
    "GI",
    "P"
  ],
  "spellcasting": [
    {
      "name": "Spellcasting",
      "type": "spellcasting",
      "will": [
        "{@spell detect magic}",
        "{@spell detect thoughts}"
      ],
      "daily": {
        "1e": [
          "{@spell control water}",
          "{@spell control weather} (as an action)",
          "{@spell dispel magic}",
          "{@spell plane shift}",
          "{@spell sending}",
          "{@spell time stop}"
        ]
      },
      "ability": "cha",
      "displayAs": "action",
      "headerEntries": [
        "The giant casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save {@dc 21}, {@hit 13} to hit with spell attacks):"
      ]
    }
  ],
  "hasFluffImages": true,
  "damageTagsSpell": [
    "B"
  ],
  "spellcastingTags": [
    "O"
  ],
  "savingThrowForced": [
    "dexterity"
  ],
  "savingThrowForcedSpell": [
    "charisma",
    "strength",
    "wisdom"
  ]
}