It is a somewhat well known fact that mimics have gained intelligence as they age, using that the blacksmiths of your village have been able to have symbiotic bonds with mimics, and now you wear this mimic gear, causing chances of blocks hits and damage taken to cause one of your mimics to grapple an enemy or bite off a limb

Level 3: Mimics Rage

The bond with your mimics have strengthend, now when taking damge roll a d12[This will change every few levels lvl6 d8 level 10 d6 lvl 15 d4] if you roll highest number the mimic attacks doing 1d12 damage

Level 7: Shared Reinvigoration

The mimic can eat the limbs or corpses of foes, healing you by 1d4 , if you kill a enemy with a mimic attack, this has a chance to activate

Level 18: Power of friendship

After many hard fought battles, your mimics have nearly become an extension of yourself providing new atronger abilities, and some abilities of mimics themselves

Level 15: Supreme mimicry

Through hard work and constant fighting your mimics have mastered mimicry and can now clone nearly everything even people [Divine or hellish creatures excluded] 

Level 10: Absorbing-Reflecting

After a long time your mimic gains arcane knowledge allowing it to eat and reflect spells