The Forgotten; the serpent race, protectors of Glint and secrets of the gods. Guiding the young races of Tyria through hardships and primitivity.
We know that after they emerged from hiding from the last rise of the dragons, they travelled Tyria, moving across the land and spreading wide. While some did stay with Glint, acting as her custodians and serving her needs, it seemed as if some suffered from wanderlust.
Evidence shows they have spread to many places in the world of Tyria. Historical remnants place them in Cantha, later wars with the charr show they moved north into the Blazeridge Mountains and the events of Nightfall show they had a large presence in Elona, having moved further south into the wastes. Eventually however, the race mostly retreated to the Crystal Desert to continue serving Glint, as well as being the overseers of Ascension.
Due to their migrations around the world, they had the opportunity to witness many things. Consequently, they can also hold many secrets. They saw the arrival of the human gods, and later, the humans themselves on the world of Tyria. But what is intriguing is the fact that the Forgotten have crossed the sea to reach Cantha, meaning that they may have perhaps travelled further into the world of Tyria.
We know that the world of Tyria is a giant place with many continents that are un-named currently. But perhaps the Forgotten moved to these continents during their travels, and witnessed history unfolding on those lands, which are mere mysteries to us now.
The extent of their journeys are unknown, as well as the potential it can offer to future stories in Guild Wars. Although we currently have not yet seen the Forgotten in Guild Wars 2, they may still be living in the world.
The desert sands await.