Creatures of the Shadows

You are Intune with the shadows and as such, you are able to communicate with it's creatures. Using an action on your turn you are able to call upon a creature with a challenge rating of 1 or lower from the shadows to help you fight. The creature is 2D and only appears a shadow. The creature has the same stats as it's regular counterpart. After 2 round the creature retreats back into the shadows and you cannot summon another until a long rest.