Blur is a 2nd level illusion spell, It is available on sorcerer & wizard classes. It is one all Spells available in DND5e. More Info’s are given below.
Blur 5e
2nd-level illusion
Casting Time: 1 action
Range: Self
Components: V
Duration: Concentration, up to 1 minute
Spell List: Sorcerer, Wizard
Casting Time: 1 action
Range: Self
Components: V
Duration: Concentration, up to 1 minute
Spell List: Sorcerer, Wizard
Your body becomes blurred, shifting and wavering to all who can see you. For the duration, any creature has disadvantage on attack rolls against you.
An attacker is immune to this effect if it doesn’t rely on sight, as with blindsight, or can see through illusions, as with truesight.