In the Dawn Era, around 6000 DE, dozens of eggs were left in the Coremeen marsh. Each egg contained a Graagvrii, a Draconic word for Greenscale. They were left here as part of a survivalist experiment, to see if they could survive on their own. The one behind this was Semuanya, the progenitor of the Greenscale race. Semuanya advocated survival of the fittest ideals, but more importantly sought to spread his people far and wide, giving them the best chance of weathering the great wars of the Dawn and God Eras.
In the Demon Spawn War, a blackscale unit led by a demon commander under Baphomet, invaded Turgon. They warred with the greenscales. The arrival of the wood elves came about from this conflict. This Covenant unit helped the greenscales turn the tide against the blackscales and their demon allies. After the war, the wood elves settled down in Turgon's south, and the remnants of the blackscale army settled down alongside the greenscales.
In the Lith-Crillion Era, gray elves from the world Kriav were sent to live here. They were Gwildath colonists. They and their off-shoots, settled along the coasts, building grand port cities like Celanil, Nénharma, Cirongwathir, and formidable coastal bastions like Gilthoniel.
In the First Epoch, the Year 10, the Phael-Tetramord War started. The elven nations united against the Tetramord. The war turned for the worse when a group of elves called upon demon aid. This summoning created the Ungorth Reddik Road, a permanent rift linking the world Bal-Kriav with the demon world Abyssm. The demon invasion forced the elves off the island, an evacuation that came to be known as the Turgon Exodus.
Today, Turgon is home to creatures alien to the world around them, most natives or descendants of people that came over from Abyssm. Most are things with demon heritage and or heavily infused with abyssal energies. Near the wetlands of Coremeen, is the Ungorth Reddik Road, the source of these creatures. Following the departure of the elves and subjugation of the Tetramord, Turgon became real estate of one of Abyss's most powerful demon lords, the terrible Demogorgon.
Turgon's terrain is warped from abyssal energies. The island is often wracked with Evil Weather, winds unnaturally cold, acid rain, and other fell happenings. Fortunately for lands and seas near, this is contained by the Turgon Boundary Ward. This magical force field varies in shape. Due to this ill-defined shape, sea travel in the area can be particularly dangerous. On several occasions, ships have passed into the Abyss-tainted waters near Turgon and suffered attacks and destruction by the island's demons.