Siubhail was created during the later stages of the 'Last War' in the forges of House Cannith and brought to Thaliost, Thane on the planet Eberron. Generally mistreated by the nobility & used as a servant, Siubhail was not given a name and left with a few other Warforged in little more than a dark cupboard when not required. After a naval battle and his Cannith master's death, Siubhail arrived on shore in Karrnath, and spent the next year or so avoiding being 'captured' or forced into the ongoing conflict, searching for a purpose. Eventually, he heard of a large group of runaway Warforged that had escaped into Cyre and followed, eventually meeting and joining the 'Godforged' the first servants of the Becoming God. The Godforged believe the Becoming God is the patron deity of all Warforged, the one who granted them souls and sentience in the first place. Since the Becoming God turned them from mere bodies into living beings, in return the Godforged will create a body worth of the Becoming God so he too can be complete and grow to his full power.
As a Warforged with few ties to the others and a distaste for (senseless) war, Siubhail decided to serve his God on the continent of Xen'drik to the south, searching the deep jungles and ancient giant ruins for artifacts worthy of use on the Becoming's form. To keep track of his progress he took to carefully mapping out his steps, a task made greatly difficult by the 'Traveller's Curse' of Xen'drik, where distances aren't always what they seem. His name, 'the Vigilant Wanderer' was given to him by a Thri-Kreen tribe after he stood guard over a small tribe of the Mantis-men left wounded in a gnoll attack. It was when returning to those same Thri-Kreen about a month later to check on their wellbeing when he vanished, appearing in Fhey.