You have gained the trust of a mimic and it will act as a companion to you.
You can take an amount of time (agreed by your DM) to show your mimic any item (including weapons) and as a bonus action have it transform into one of those items.it will take on the properties of that item ( excluding magical ones) and can be used as such.
If the transformed mimic is removed from your possession it will use its turn to move towards you in attempt to return to your possession.
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