A past magical disaster or uncontrolled surge of power in a particular place can cause the fabric of magic to unravel, creating a wild magic zone. In such an area, which is typically no more than 300 feet in diameter, magic behaves unpredictably.
Whenever a creature expends a spell slot to cast a spell in a wild magic zone, roll 1d20. If you roll a 20 on the die, roll on the Wild Magic Surge table in the Player's Handbook to create a magical effect.
{
"name": "Wild Magic Zone",
"page": 69,
"__prop": "hazard",
"source": "XDMG",
"entries": [
"A past magical disaster or uncontrolled surge of power in a particular place can cause the fabric of magic to unravel, creating a wild magic zone. In such an area, which is typically no more than 300 feet in diameter, magic behaves unpredictably.",
"Whenever a creature expends a spell slot to cast a spell in a wild magic zone, roll {@dice 1d20}. If you roll a 20 on the die, roll on the {@table Wild Magic Surge|XPHB} table in the {@book Player's Handbook|XPHB} to create a magical effect."
],
"trapHazType": "ENV"
}