You can nimbly dodge out of the way of certain area effects, such as a red dragon's fiery breath or a lightning bolt spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.
Evasion
Raw data
{
"srd": true,
"name": "Evasion",
"page": 93,
"level": 15,
"__prop": "subclassFeature",
"header": 2,
"source": "PHB",
"entries": [
"You can nimbly dodge out of the way of certain area effects, such as a red dragon's fiery breath or a {@spell lightning bolt} spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail."
],
"className": "Ranger",
"classSource": "PHB",
"subclassSource": "PHB",
"subclassShortName": "Hunter"
}