Island Description

This island is located in East Blue. There were inhabitants on this island long ago, but there are no more, because on this island, no crops can't be grown - the ground is so swampy and damp, that it is not possible. The only inhabitants on this island are wild beasts, which include bears, boars and ... raptors! The weather on this island is rainy year long with many thunderstorms. The sky is black all the time - that's why its called 'Dark Island'. The island itself is not large, only a 10 km radius, but the damp ground, thick forest and stormy weather (plus the dangerous animals) make it very hard to move around on this island.
In the middle of the island lies an old temple where a hidden passage is found into some cavern system with many secrets and treasures. Many dangerous and terrifying beasts also lurk in those caverns, but the rumor goes that: a legendary weapon is hidden there. So many adventurers (pirates included) have tried to find it, but for now the rumor is still a myth: many couldn't find the ruins, and those who have found them, just didn't return from the depths of those dangerous caverns.

What civilization tried to live on that island? Are you strong enough to fight against raptors alone or do you need a crew before you are trying to go on that island? Where is the old temple? How long and which dangerous animals live in the cavern system? Is there really a legendary weapon hidden there? Well, the only way is to find it out yourself, isn't it? Beware, death is almost certain on Kurai Shima!