Murkers

''While some pirates and smugglers attempt to make homes on the border of the fog lines the law isn't the only thing they must worry about. Murkers, periodically emerge from the fog and while relatively docile beneath the fog border get enraged by the sunlight and different air composition. Many a smuggler den has been emptied by an errant family of murkers.''

Description
Murkers are giant spider crab like arthropods with 8 legs and two long narrow pincers. Murkers have a leg span of on average of 6 meters from claw to claw.The body may grow to a size of 80 cm or 32 in (carapace width) and the whole crab can weigh up to 50 kilograms (110lb). Female have been known to have a carapace width of 100 cm. Much of their mass is concentrated within their limbs in order to climb the steep slopes of Caligoven bellow the fog line. While murkers have long and narrow claws they are strong enough to snap the limb off a fully grown human.

Behavior
Murkers, while unintelligent, gather in groups of between 10-30 members near the edge of the fog line to partake of their preferred diet of stray floaters, bloat crabs, and fog ferns. When encountered beneath the fog Murkers are quite docile and pay no mind to humans who journey near them. However, once exposed to sunlight and a more oxygen rich atmosphere, they go on a rampage due to shock. They stay in this enraged state attacking all they see until they go back into the fog or die.