Geryon

{
  "name": "Geryon",
  "page": 173,
  "__prop": "legendaryGroup",
  "source": "MTF",
  "lairActions": [
    "On initiative count 20 (losing initiative ties), Geryon can take a lair action to cause one of the following effects; he can't use the same effect two rounds in a row:",
    {
      "type": "list",
      "items": [
        "Geryon causes a blast of cold to burst from the ground at a point he can see within 120 feet of him. The cold fills a cube, 10 feet on each side, centered on that point. Each creature in that area must succeed on a {@dc 21} Constitution saving throw or take 28 ({@damage 8d6}) cold damage.",
        "Geryon targets one creature he can see within 60 feet of him. The target must succeed on a {@dc 21} Wisdom saving throw or become {@condition restrained} for 1 minute. The target can end the effect on itself if it deals any damage to one or more of its allies.",
        "Geryon casts the {@spell banishment} spell."
      ]
    }
  ],
  "regionalEffects": [
    "The region containing Geryon's lair is warped by his magic, creating one or more of the following effects:",
    {
      "type": "list",
      "items": [
        "Intelligent creatures within 1 mile of the lair frequently see shimmering portals leading to places they consider safe. Passing through a portal always deposits a traveler somewhere in Stygia.",
        "Freezing strong winds howl around the area within 1 mile of the lair.",
        "Howls and screams fill the air within 1 mile of the lair. Any creature that finishes a short or long rest in this area must succeed on a {@dc 21} Wisdom saving throw or derive no benefit from the rest."
      ]
    },
    "If Geryon dies, these effects fade over the course of {@dice 1d10} days."
  ]
}