Companion in the shadow

wen summoned 

Decoy

- You gain the following Shadow Fiend attribute. - As a bonus Action when you Make a weapon attack and succeed you may channel your newfound Shadow Attribute forming a shadowy humanoid directly behind the hit creature. This shadowy humanoid looks identical to you

- The Shadow Fiend has 5+(Cha)mod health when formed. The Shadow Fiend duplicates any weapon damage done by you and counts as an Ally for you. Shadow Fiend can flank for you. - stays for 1d6 rounds after its summoning round. - has 15 movement in light, 30 movement in dim lighting or darker. - Shadow Fiend has vulnerability to Light damage.

Look out form

When your shadow is summoned this way it lasts for 8 hours
It looks exactly like you at whenever form you are in
exactly the same stats as you'res
except for intelligence which is 8 (-1)
You can give it simple commands to look out or gather supplies or do an act
If it senses danger it will telepathically notify you of danger
(But Not of what kind)
You can only have it gather one thing
Or you can command it as an action to do a certain performance of your choice it can only last 30 seconds (5 rowns)

(In combat it takes its turn either right before you or right after you. your choice)

wen not summoned

Shadow Strike

. When you make a melee attack roll, you can increase your reach for that attack by 10 feet. Your shadow stretches and delivers the attack as if it were you. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Corner peak

You can have your shadow look out for you giving you the ability to cast (pass without trace) only on yourself