Night Walker

An assassin who specializes in infiltration and you can even use your shadow to help you in your escapades. You specialize in stealth and assassination you can even use your shadow to form tangible items. You don't work alone not when you  have access to your perfect double whenever just make sure your never directly in the sunlight.

Shadow Channeling

Starting at 3rd level, you learn to channel your shadow to attack people gaining access to the spell Inflict Wounds.

Silhouette

Your shadow can move within 50ft of you and looks exactly like you but as if your were silhouette you and you can reach your shadow at any time and walk though it.

In combat if you and shadow are together you have advantage on stealth checks, you can take a action to swap places with your shadow, and use a bonus action to have your shadow move 30ft that isn't in direct sunlight.

Perfect Plan

Starting at 9th level, why stop at one you can split your shadow into up to three different versions and anyone in their direct line of sight they can attach them self to their shadow. You can either use your bonus action to share the sense of all shadows including perception, smell, taste and sight. You use your action make them all use your wisdom modifier to roll a grapple with advantage if there in darkness against a opposed dexterity check restraining them but your shadows cannot take any other actions.

Use Magic Device

By 13th level, you have learned enough about the workings of magic that you can improvise the use of items even when they are not intended for you. You ignore all class, race, and level requirements on the use of magic items.

Thief’s Reflexes

When you reach 17th level, you have become adept at laying ambushes and quickly escaping danger. You can take two turns during the first round of any combat. You take your first turn at your normal initiative and your second turn at your initiative minus 10. You can’t use this feature when you are surprised.