From the publisher's website:

Lead your Vikings to undiscovered islands in order to expand your territory; build farms and churches and gather your fortune. But beware for your fortune will not go unnoticed very long. Ships on the horizon threaten your great land and you will have to defend yourself against this menace. To expand your territories and clan, you will need to master the game’s clever rotating wheel. The price for islands and Vikings will change as players acquire more of them. The game will be tense until the end, and you will need to protect your islands against the ships that sail on the horizon. Are you the leader whose clan will rise above the others?