You slip into your enemy’s blind spot with swift, subtle movement.
You spend half of your movement to make a Stealth check opposed by the enemy’s Awareness.

On a success, you may hide from that enemy even without cover.

While hidden, you gain advantage on your next attack. Enemies can still target you, but only with melee attacks, and they do so blindly: their attacks have Disadvantage and cannot gain Advantage.

You stop being hidden immediately after the attack.