You were forged in the fires of Purphoros's forge. Your appearance bears a metallic sheen and visible joints. The Anvilwrought Characteristics table suggests details of your life or origins. Additionally, you gain the following traits.

Constructed Resilience.

You were created to have remarkable fortitude, represented by the following benefits:

You have advantage on saving throws against being poisoned, and you have resistance to poison damage.
You don't need to eat, drink, or breathe.
You are immune to disease.
You don't need to sleep, and magic can't put you to sleep.

Sentry's Rest.

When you take a long rest, you must spend at least six hours in an inactive, motionless state, rather than sleeping. In this state, you appear inert, but it doesn't render you unconscious, and you can see and hear as normal.

Anvilwrought Characteristics
d6	Characteristic
1	An oread who works in Purphoros's forge is the closest thing I have to a parent.
2	Purphoros made me to serve him.
3	I was created decades ago and, fearing that I'm growing obsolete, recently fled Mount Velus.
4	Purphoros regrets my creation and wants to reforge me into something better.
5	Purphoros intended me to carry on his work by making even greater creations of my own.
6	Someone in Mount Velus implanted a terrible secret within me in order to smuggle it out into the world.

Source: MOT, page 12