
This is a Tibetan prophecy and ties in with a lot of the dogma established in the series. According to this Eastern legend, the Spirits of the unholy Powers were incarceratied, sealed countless fathoms below in the darkness of the ocean. There they remained imprisoned by the beneficent hand of God, until, once in a thousand years, it was fated that a fisherman had it within his free choice to release the dreaded fiend, unless he cast his terrible catch straight back into the depths.
This tale bears a striking resemblance to the verse "And when the thousand years are expired, Satan will be loosed from his prison." from Revelations 20:7. In his religious studies Matt's found a lot of interesting correlations between the Bible and other ancient texts. The Sumerians had a "flood" myth long before anyone had ever heard of Noah.
Taken from Lady Pendragon Vol.3, #1