Clockwork Warforged

You are constructed from an older design that needs to be wound up:

• Increase your Constitution score by 1, to a maximum of 20.
• When you roll a Hit Die to regain hit points, the minimum number of hit points you regain from the roll equals twice your Constitution modifier (minimum of 2).
• When you drop to 0 hp you do not have to make death saves. You become an inert object until someone turns your key three times. you cannot reach your own key.