シャドームーン
is the legendary warrior among the Gorgom. Bilgenia was born 30,000 years ago on a day of the solar eclipse like Kohtaro Minami and Nobuhiko Akizuki. However, the Creation King did not favor him and therefore did not give him a King Stone. He was then sealed in a coffin for almost trying to revolt against him. The three High Priests awakened him when the Creation King reprimanded them for not doing their job in killing Black, ordering them to release the curse on the coffin Bilgenia was imprisoned in. He was both a pain for Kamen Rider Black as well as to Gorgom. In episode 22, he turned his face white from 30,0000 years ago, making him more powerful and more arrogant. In episode 25, he had Yoichi Daimon's pupil Egami create the Hellshooter: an equivalent to Road Sector. He used it to challenge Kamen Rider Black and Road Sector only for the Hellshooter to be destroyed. During Gorgom's latest attempt to use Kyoko's life force to awaken Shadow Moon, Bilgenia stole the Satan Saber and attacked the High Priests before running off with Kyoko and going after Black to take his King Stone for himself. However, Kohtaro and Kyoko manage to hide from Bilgenia as he decides to attack the city to flush Kohtaro out by using his Satan Cross to cause anarchy with a group of young men. Arriving to the scene, Black battles Bilgenia until Shadow Moon finally awakens and he claims the Satan Saber, forcing Bilgenia to retreat as his influence wears off. Returning to the Gorgom shrine, Bilgenia fought Shadow Moon who disarmed and then killed him.