Conjure Mimic

You create a Mimic that takes the form of 1 object  you can see. The Mimic is friendly to you & creatures you see as friendly for 10 minutes after being summoned. The Mimic dissolves when the it is killed or the spell ends.

At Higher Levels: For every level above 4th, the damage dealt by the Mimic increase 1D8 & you choose 1 of the following feature to grant it, Increase it's size category (as well HP by 3D8+6), Doubling the amount of time being friendly, the Mimic gains Spit Acid (Spitting Mimic) or, at 7th level or higher, Caustic Mist (Hoard Mimic).