Since you are a construct, you do not need to eat, sleep or breathe. Additionally, you power down for four hours instead of sleeping.

You have proficiency in the Perception or Stealth skill.

Before you do something, you may take the study action and use it on a creature. If you succeed, you figure out their intentions towards you, hostile, neutral or friendly. 

During a long rest, you may spend at least two hours merging a weapon into yourself. You may have as many merged weapons at a time as you do hands.As a bonus action, you may extend or retract this weapon in order to use it. If the weapon requires ammunition, you may insert it into your arm. You must attune to a magic item in order to use it this way.