Elves were dimly aware of the world outside the Island Of Thorns. Between wars and eternal struggle for survival on their island, they had little time or possibility to wonder what lies beyond the horizon.
That does not mean that it stopped them from wondering entirely.
One of the tribes- or clans, for this is how they came to call themselves- happened to be forced out of their home valley during particularly vicious war among them and the Steelsong Clan. They found shelter in gloomy woods that grew on the border of the ocean. Most elves refused to tread there, justly afraid of monstrosities that lurked in shadows, but this particular clan had no other choice.
They settled down, braving the forests. And soon they became the first of elven kind to hear and heed the siren's call of the sea. While other elves feared and loathed it, they begun to love it. It was not long, until they learned the craft that was necessary for them. shipbuilding. While their first boats were crude, and often destroyed by raging storms, they soon managed to create first reliable vessels, capable of crossing the seas.
Not long after, a first ship was sent to discover the lands outside the island, on personal order of the Goddess, Ios. After many weeks of tedious journey, this sleek craft, carrying one of the House Of The Crows mages aboard managed to land on unknown shores. Thick jungle was visible in the distance, as they stood on the sand beach, wondering what- if anything- can live in such paradise.
2d6+3=121x advance civilization (ship building) 1x command avatar: command order: House of Crows: send ship to the south. Landed at the jungle island.