Blade Mirage

You twist illusions around a melee weapon you are holding. When you cast the spell, and on each subsequent turn for the duration as a bonus action, you can create feinting blows with the illusory copies of your blade, distracting your target and giving you advantage on the next weapon attack against that target before the end of your turn. The spell ends early if let go of the weapon you cast it on.
As an action, a creature that can see you can make an Intelligence (Investigation) check against your spell save DC. On success, you no longer gain advantage from using the illusionary blades when making a feint against that creature, rendering the spell impotent against that creature.