Evasion is a Monk feature gained at level 7 in the 2024 SRD. When you're 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.
When you're 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.
You don't benefit from this feature if you have the Incapacitated condition.