Workers

The Workers (A.K.A. Warforged) of Meara were created by great smiths of the Dwarven nation, about two hundred years ago, so very recently by their standards. They are kept as property in the mountains of their "home," and very few have ever been seen away from there. Those rare workers who evade their built-in controls and manage to escape without being destroyed have been welcomed as lost children in Avaria, played with as toys on the plains, and looked askance at everywhere out of fear of the strange and unknown.

Worker Species

Age. Workers are considered as adult as they get when created, and have no known upper limit on lifespan. Some of the very first batch may still be doing their jobs somewhere under the mountains.
Size. Workers stand 6 to 7 feet tall and weigh from 275 to 325 pounds. Your size is Medium.
Speed. Your base walking speed is 30 feet.
Eye Lights. In order to see in dim or dark conditions, you can spend an action to cause patches of the metal on your face to illuminate with the effect of a light cantrip. This creates bright light in front of you to a distance of 20 feet and dim light for a further 20 feet. Every Worker's eye lights have a specific pattern and color or combination of colors so they can be easily told apart from a distance when lit.
Constructed Resilience. 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.
Integrated Protection. You gain a +1 bonus to Armor Class. You can don only armor with which you have proficiency. To don armor, you must incorporate it into your body over the course of 1 hour, during which you must remain in contact with the armor. To doff armor, you must spend 1 hour removing it. You can rest while donning or doffing armor in this way. While you live, your armor can't be removed from your body against your will.

Common Worker Cultures

While all Workers originated within the halls of [Dwarven Empire/Kingdom], those who have found their way to the outer world may well have sloughed off the shackles of their upbringing and taken on the ways of people encountered later. So while the Deep Dwarven culture is very common amongst them, other cultures are valid choices for a PC as well.