Vicious Shadow

Caster points at a target, and says "Beware what lurks in the dark." 

The target then must make wisdom saving throw of 13 or higher. If the target fails, a shadow of the target appears and mimics the targets physical weapon, or most recent cast spell and deals 2 times the base amount of damage to the target. 

In the instance of a magic user being attacked by the shadow, the caster has control of where that shadow uses the most recent spell. 

The shadow will immediately dispel on any hit made.