Zorc Necrophades

Zorc Necrophades  is a demon who created the Shadow Realm. He serves as the main villain in the Dawn of the Duel arc, as well as the final villain of the Yu-Gi-Oh! anime.

Zorc has a large dragon/snake appendage between his legs. The dub changes this appendage to protrude from his chest instead of between his legs, due to its likeness to the phallus. In the bunkoban of the manga, it is made spiral around him, rather than point out suggestively.

Biography
Zorc Necrophades was born eons before the Millennium Items were originally created (in the English anime, he is the creator of the Shadow Realm, and therefore predates the items, though they were made using his power). He was summoned by Akhenaden who brought all 7 Millennium Items together in an underground crypt in Kul Elna village. 3,000 years ago (5,000 years ago in the Dub).

Zorc attempted to destroy the world, but was stopped by Pharaoh Atem. Atem sacrificed his life by sealing himself within the Millennium Puzzle and Zorc within the Millennium Ring. Zorc later resurfaces when he possesses Ryo Bakura, though he has no memory of who he really is, except that he wants to gain all seven Millennium Items in order to gain a great power. The second time Atem faced off with Zorc, he was able to kill Zorc by fusing the Egyptian Gods to form The Creator God of Light, Horakhty, of course the only way to do that was to regain his lost name. Before facing Atem, Zorc had already defeated Exodia, the individual Egyptian God monsters, and Blue-Eyes White Dragon. In the anime, he also fought Blue-Eyes Ultimate Dragon, which appeared to rival his strength, most likely due its property of being "the ultimate creature of light." During the fight, Atem fused himself with Blue-Eyes and created Dragon Master Knight, which Zorc was still able to defeat. All of the above made him seem unstoppable until he was killed by Horakhty.

Effect
It is noticed that although Zorc's attack was not defined, when it destroyed a monster in battle, damage was dealt to the owner of that monster equal to the attack of the destroyed monster (battle damage wasn't applied). For the Keepers of the Millennium Items and those residing in the Pharaoh's time where life points were not applicable, an equivalent portion of their 'power' was depleted.