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The orcs could have reached the islands during the Uprising:
The orcs rebel in the Seven Cities and in the Falcon Empire. Despising their masters and the Dragon Gods, they declare themselves free. In the Falcon Empire, troops rise up against the orcs to suppress the rebellions and force the orcs to worship the elemental dragons once more. After a series of brutal battles, the orcs are defeated. The survivors scatter in all directions, including to the southern deserts, the northeastern steppes, and the eastern Border Islands. A terrible storm sinks the Empire's fleet, which was following the fugitives to the islands. The Emperor takes this as a sign from the Dragon Gods, and the persecution of the orcs ceases.
Orcs were made from slaves, so couldn't a member of the royal family go on a journey, end up in slavery, lead a rebellion, take the orcs to the islands, meet a Naga there, and so on? I think it's logical :smile01:
By the way, if the original game follows this plot, then in the future, in the add-ons, the second demon invasion will be covered, where elves, mages, etc., will be introduced.