At 18th level, you gain immunity to lightning and thunder damage.
You also gain a magical flying speed of 60 feet. As an action, you can reduce your flying speed to 30 feet for 1 hour and choose a number of creatures within 30 feet of you equal to 3 + your Charisma modifier. The chosen creatures gain a magical flying speed of 30 feet for 1 hour. Once you reduce your flying speed in this way, you can't do so again until you finish a short or long rest.
{
"name": "Wind Soul",
"page": 51,
"level": 18,
"__prop": "subclassFeature",
"header": 2,
"source": "XGE",
"entries": [
"At 18th level, you gain immunity to lightning and thunder damage.",
"You also gain a magical flying speed of 60 feet. As an action, you can reduce your flying speed to 30 feet for 1 hour and choose a number of creatures within 30 feet of you equal to 3 + your Charisma modifier. The chosen creatures gain a magical flying speed of 30 feet for 1 hour. Once you reduce your flying speed in this way, you can't do so again until you finish a short or long rest."
],
"className": "Sorcerer",
"classSource": "PHB",
"subclassSource": "XGE",
"subclassShortName": "Storm"
}