Feud
The barbarian tribes had been at war with the Arcadians for so long that one would have to check the books to remember when it started. The history and feud between the two different parties could be traced up to 4000 years ago.
Separated by the Great Sea, the Arcadians were established on the West, while the barbarian tribes were situated on the East.
The only land that connected the two was the Chaotic Plains, which was located down south.
The orcs had infested and occupied most of the land on the south, the only way for the barbarians to fight the Arcadians was by the sea, which was no small matter.
Even though the barbarians were great seamen, with the limited transportation methods they had, coupled by the unpredictable sea with its violent waves and terrible storms, it had proved to be difficult for them to launch a massive invasion successfully. This fact was further strengthened by so many failures they attained throughout the river of time.