Dark reflection

Basically there is a reflection of your skin but darker and it will fight you with any weapon you have in your inventory. and no matter what you do the dark reflection will do the same the only way to defeat them is to hit a mob that would come for you like a bee or a enderman then they will attack the dark reflection the dark reflection will drop your stuff and sorta double your stuff but if you die it takes your stuff and runs away it comes back every 30 days but when it comes back it does not give you all your stuff back