Splinter from the Coffin of Henry Morgan
Few pirate captains if any have matched the fame and fortune of “Bloody” Henry Morgan. It was he who led successful attacks on Porto Bello, Maracaibo and Panama, eventually claiming a hoard of valuables and building the loyal group of buccaneers known as the Brethren of the Coast. He died in Jamaica and was buried in a cemetery near Port Royal.
The old buccaneer's story doesn't end there, however. It is said that the 1692 earthquake, which destroyed some two thirds of Port Royal, also disturbed Morgan's resting place. Some say that his coffin rose to the surface of the water, showing the pirate's indomitable spirit. There are even those who claim to have recovered splinters from the coffin, ones that are imbued with Morgan's own temerity.
In game terms, a character who possesses a splinter from Morgan's coffin gains the benefits of the Die Hard feat. Those who already possess that feat become even harder to kill, able to fight until reaching a negative number of hit points equal to their Constitution scores.