At 7th level, your instinctive agility lets you dodge out of the way of certain area effects, such as a blue dragon's lightning breath or a fireball 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": 76,
"level": 7,
"__prop": "classFeature",
"source": "PHB",
"entries": [
"At 7th level, your instinctive agility lets you dodge out of the way of certain area effects, such as a blue dragon's lightning breath or a {@spell fireball} 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": "Monk",
"classSource": "PHB"
}