In case you weren't finding the Playstation 3 RPG Demon's Souls challenging enough, be sure to revisit it this weekend. According to a cryptic press release from publisher Atlus:

Early reports from the Kingdom of Boletaria indicate that the Old One's power grows. We've discovered that the nefarious Demon will seek to descend the land in pure blackness on All Hallow's Eve. His minions will be more powerful, but the rewards for those who seek to challenge them will be greater as well. We don't know how long this dark tendency will last, but we do advise those prone to controller-into-LCD syndrome to proceed carefully.

There are no specifics about what exactly this means, but one of the gameplay mechanics in Demon's Souls is that different parts of the world can be swayed towards black or white. Black means the monsters are tougher to beat, but they drop more valuable treasure. White makes the going a bit easier, but for a reduced reward. If you sway the world far enough in one direction or the other, you unlock unique areas and creatures. My guess is that the game gets a global shift towards black over the weekend.