Warforged

A race of constructed bodies, presumably meant to house spirits.   The first warforged were created some time after the settlement of Meras when a few strange humanoid shells were found in the wilderness. Those that could be repaired were brought back and studied; they were well beyond anything the city dwellers were capable of building.
Research led to the discovery of an arcane battery. Through magic and some trial and error, a pair of mages was able to recharge the batteries but the shells remained inert. The mystery of them persisted for months until one morning, the wizard half of the research team opened the doors to the workshop to find a very awake and somewhat confused robot browsing her library.   The newly revived robot identified himself as a warforged. He was fluent in common and elvish, knew how to craft bows and arrows, and could play a lute beautifully. However, he had no memories prior to waking up that day. After a quick run through on where he was and about a hundred questions from the mages in turn, they learned that a spirit had entered the empty warforged (dubbed Sonata) overnight and merged with the arcane battery.   It took a few years and the help of people who had a knack for speaking to spirits, but gradually all the recovered warforged bodies were revived. Once a spirit merged with the battery, the warforged woke with a unique voice, personality and set of skills that seemed to draw from both the original spirit and some inherent part of the warforged's design.
Periodically an explorer would find a warforged body discarded in the Wilds and take it back to the city for repairs. At present their population is relatively small.   Observed traits

• Warforged respond to healing magic; it appears that the arcane battery is responsible for processing it and applying any healing to their bodies.
• If a warforged is damaged to the point that their body shuts down, the spirit is released from the battery. If the warforged is revived and the spirit is still around, it will resurrect with the same personality.
• Warforged can choose to pass on if they wish; the spirit is released and the body goes inactive. If the different spirit takes to the body, it will awaken as a new person.
• Warforged have the unique ability to wander into the Mists without taking most of the physical effects that organic lifeforms do.