6. Kudara, Otogi: Myth of Demons (Xbox, 2003)
Dreamy Xbox slasher Otogi: Myth of Demons is a magic moment from start to too-early finish, pulling some pretty impressive bosses out of its Japanese mythology grab-bag on the way.
While not quite as daunting as the nailed-down Demon God, it's the early encounter with a monstrous electrically-charged centipede, Kudara, that was truly a boss with the Power of X.
Above: It's the boss equivalent of a game of chicken - don't slash until you see the whites of his tonsils.
Encircling his Zen garden graveyard like a homicidal Slinky, the only way to bring Kudara down is by timing a last-minute dive out of the way of his jaws and slapping him upside the head - usually resulting in a shower of lightning for your troubles.