our metal coating makes you more resistant to wear. Your Dexterity score increases by 2 and your Constitution score increases by 1. 

You cannot be affected by any form of healing spell or potion, but traits like the paladin’s “lay on hands” still work on you. Instead, you regain 2d4+2 hit points if you are targeted by the mending cantrip.

Your metal body comes with its benefits and flaws. You are immune to the poison damage and the poisoned effect, due to having no organs. You are vulnerable to acid damage, as it eats through your metal flesh. You do not need to eat, drink, or breathe, but can if you so please.

Since you are made out of metal your legs don't get tired so you have advantage on athletics

You can speak, read and write Common and one other language. This other language should ideally be one your master would be able to teach you, or that you would learn to interact with the people around you.

You have mechanical eyes with built in dark vision so you get 60ft of dark vision