Sea Stingers populate the waters of the Kalidus Channel. They swim in infinite numbers along the water's surface and leap out in an arc, only to plunge back into the ocean and continue their way.
Even though they usually die in one hit from most weapons and not really posing a threat individually, it's the vast numbers they attack with what can make the areas they appear in difficult to traverse, as it can only take a single missed hit to send the player into the water, where the rest of the shoal could make it hard to get back to solid ground.
