Unexpected Visitors

In a land where dragons and goblins aren't a surprise to us who run into them... Karucaw Island is the third largest island in the world, and it is surrounded by water if you reach the very end. At the very end though, awaits a terrible fate. No one has ever tried to reach it since the last brave young man who's body parts were found torn and mangled, blood splashed everywhere in the center of the town there. The town is the only one on this island, and in it lives many villagers. But outside the villager world, gods and goddesses roam, protecting their home from danger. But when a strange pair of children about 10 years old appear out of nowhere, things start going down... Why are these things happening, and what started them??