Charm of the Crystal Heart

{
  "name": "Charm of the Crystal Heart",
  "page": 167,
  "type": "Charm",
  "__prop": "reward",
  "source": "ToA",
  "entries": [
    "This charm grants you immunity to piercing and slashing damage from nonmagical attacks, but you gain vulnerability to bludgeoning damage. These effects last for 10 days, after which the charm vanishes from you."
  ]
}