Synthetic Construction

As a synthetic creation designed to replicate life as closely as possible, you maintain an almost flawless outward appearance for one of your species. However, under that layer of synthetic skin is a body forged by mortal hands. You retain all features of your base race except the following:

Type. You are a Construct, meaning spells and effects that only apply to humanoids do not affect you.

Mechanical Nature. You have resistance to poison damage and immunity to disease, and you have advantage on saving throws against being paralyzed or poisoned. You don't need to eat, drink, or breathe.

Artificial Form. As a construct, you are unaffected by most healing magic. The only way to restore HP is by resting or the Mending spell. If the Mending spell is cast on you, you can spend a Hit Die, roll it, and regain a number of hit points equal to the roll plus your Constitution modifier (minimum of 1 hit point).

Sentry's Rest. When you take a long rest, you spend at least 6 hours in an inactive, motionless state, instead of sleeping. In this state, you appear inert, but you remain conscious.