Blur

2nd-Level Illusion Spell (Artificer, Sorcerer, Wizard)

Casting Time: Action
Range: Self
Components: V
Duration: Concentration, up to 1 minute

Your body becomes blurred. For the duration, any creature has

If you have Disadvantage on a D20 Test, roll two d20s and use the lower roll. A roll can't be affected by more than one Disadvantage, and Advantage and Disadvantage on the same roll cancel each other. See also D20 Tests.

on attack rolls against you. An attacker is immune to this effect if it perceives you with

If you have Blindsight, you can see within a specific range without relying on physical sight. Within that range, you can see anything that isn't behind Total Cover even if you have the Blinded condition or are in Darkness. Moreover, in that range, you can see something that has the Invisible condition.

or

If you have Truesight, your vision is enhanced within a specified range. Within that range, your vision pierces through the following:

Darkness. You can see in normal and magical Darkness.

Invisibility. You see creatures and objects that have the Invisible condition.

Visual Illusions. Visual illusions appear transparent to you, and you automatically succeed on saving throws against them.

Transformations. You discern the true form of any creature or object you see that has been transformed by magic.

Ethereal Plane. You see into the Ethereal Plane.

.

Source: Player's Handbook, p. 248