You can transform into a small or medium object of your choice, but nothing living (plants are ok). If you turn into a weapon, your damage is the damage of your mimic bite attack but with either, bludgeoning, piercing, or slashing damage. If you turn into something such as a chair or platform, you can have up to your carrying capacity set onto you. If it surpasses it you take 1d8 bludgioning damage and other creatures have advantage on detecting you. roll a stealth check with adventage, that number is your current hidden modifier. Once transformed you are relatively undetectable unless someone specifically makes a note to look directly at you or saw you transform. If someone makes a note to look at you they must roll a insight check at disadvantage, if they pick you up or interact with you they roll a regurlar insight check. (At higher levels: 10, you get to transform into large objects. 17, you can turn into giant objects. 

I already told you

You can Bite your opponent for 1d6 piercing damage. They also have to roll a DC10+str saving throw or you can grapple them. This bite can come from anywhere on your body and is larger than your usual mouth

(Add an extra 1d6 at level, 4, 8, 12, 16, and 20.

You can see in the dark up to 30d feet in front of you.