More Bisaya: fall of samahen empire was frought w/ bloodshed, the samahen had conquered the known world, their campaign of genocide had all but wiped out the dwarves and the elves, they'd subjugated the lesser men they'd encountered, and with no one left to fight they fought themselves. Their vile magics became viler, they perfected evil, binding demons to do the simplest tasks that they might have more time to kill eachother. their homeland, and isle roughly the size of ireland (or florida) was riped apart by civil war, and the provinces fell to local uprisings. the final days of the empire saw atrocities commited on the homeland, and the very fabric of reality there has never recovered.
The forces of chaos that have infiltrated Ancardia corrupt both the surrounding landscape and occasionally the player's character, causing mutations, such as antennae or a tail growing on the PC. Some mutations are helpful, while others make the game much harder; many have elements of both. Players need to be resourceful and adaptable due to the randomness of these mutations. While there are limited opportunities in the game to mitigate or remove corruption effects, taking too long to close the chaos gate causes the corruption rate to increase dramatically. After becoming fully corrupted, the game ends, as the character has become a "writhing mass of primal chaos". The chaotic ending requires the character to be almost fully corrupted.
Besides background corruption, some powerful chaotic artifacts can actually cause the character to become corrupted merely by carrying them. Other, less powerful chaotic artifacts only corrupt when actively invoked or wielded. Generally, most artifacts and magic items are safe to carry and use, and only the most powerful items affect corruption rates.
island is mined for bloodstone now. change stone from empire to trading company, set timeline forward to late renasaince/age of piracy. gunpowder exists alongside magic.
Fog like king story the mist comes down off the mountain range irregularly, spreading corruption to whatever it touches. colony built at foot of mountains, as bloodstone only found there. single town westmarches style.
Pull in cult of heroin, spreading among the recent immigrants to the isle, worship a dark godess of chaos. The islnad gets under your skin in weird ways, and people adapt.