Pincer's Isle

Pincer's Isle is an island in the Endless Sea, renound as a sanctuary for pirates. It's shape is a long, broad, shallow-sloped mound which houses the largest city in the Endless Sea, from which two fang-like rocky protrusions reach eastword, forming a long bay, the only deep-water harbor in the region.
The ground is said to be hollow. Beneath a thin layer of grim and sand lies a polished mound of bedrock, renound for its lightness and strength. Below that is said to be enormous caverns lined with prescious gems. There are several mines worked by slaves, but little is known about them. Despite the supposed richness of the island's caves, piracy remains the dominant industry by far.

History, Religion & Myths

The island's original inhabitants claim it to be the claw of the Living God Khytos. They kept it pacified with blood sacrifices. After an especially poor fishing season, so many were sacrificed that the locals nearly drove themselves into extinction. From then on, they began inviting pirates to their shores, trading coin for captives to cut open on their crystaline altars, breeding more in scores of brothels lined up along the docks. 
Briggands from across the world flocked to its shores, such that millenia ago the names of its original inhabitants were forgotten, but their rituals remain. It first appears in continental history when the the Bronzen Men, sick of the Pirate King's raiding, assembled a fleet to attack the isles. The Emperor's daughter went to the isle, either as an envoy, captive, or lover of the Pirate's King, and was cruely sacrificed. Thereafter, a tsunami rushed over the Bronzen Empire's shores, destroying its fleet, crippling its trade, and initiating its slow decline, but it was decades until a Pincerlander was seen again. Her father died of grief in the aftermath, and nothing more is known of these events, but the Isle has long since reclaimed its status as the capital of villany.