Typhn's Slime double

Upon being struck by a melee, ranged, or spell attack, you may use a reaction to cast this spell, a Jelly replica of yourself will form within 5ft of you interposing between the attack and yourself. 

This double will persist after being attacked and is considered to be the ooze typing despite its shape. it mimics your stats but does not have any equipment. It shares your proficiencies and knows any cantrips you do. It will only act to protect you and will attack any creature you do. It will disperse either as a free action taken by yourself or upon reaching 0 hitpoints. 
It also mimics your AC and HP.

When struck by a melee weapon, the attacker will take 5 acid damage.

For every 2 spell slots above 3rd, another slime double will be summoned.