One thousand years ago, a mortal man was cursed by a demon and condemned to a life of eternal suffering. The man tried many different ways to lift the curse but none had any effect. As time wore on the curse corrupted him - his body grew emaciated, his limbs lengthened and deformed, and his appetite could never seem to be satisfied. Soon, a compulsion to eat human flesh manifested itself, and though he fought against the urge, the insatiable hunger drove him mad, and he began savagely feeding on the townspeople of his village.
The local authorities were powerless to protect their town against such an immortal killing machine. They couldn’t kill it, so they were forced to contain it, and as a makeshift solution they locked it partially within a diving helmet as protection against its fearsome maw. To ensure that it would never break free from within the helmet, the key was tossed into the sea, where it would be lost forever - or so they thought. Instead, the creature escaped from the cell it had been held captive in, but it could not remove the diving helmet, which heavily impaired its ability to hunt.
Now, the Sea Demon roams the ocean floor, desperately seeking the key that can free it from the restrictive prison of the diving helmet, so that it can hunt unimpaired and sate its thousand-year hunger.
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