Three High Priests

The Three High Priests (三大神官) are second only to the Creation King, and they carry out his will. Upon their sacrificing their Stones to revive Shadow Moon, the dying High Priests undergo a transformation into new physical forms called the Grand Mutants (大怪人), reborn as Shadow Moon's emissaries. Setting up for his final battle with Kotaro, Shadow Moon sends the Grand Mutants to attack the city, overpowering the police as everyone runs out of Tokyo. Kotaro arrives to fight them all before they fallback, telling Kotaro he cannot stop the rise of Gorgom. Eventually, the three are killed off one by one.

Darom
High Priest Darom (大神官ダロム) is the leader of the High Priests, having a pale ancient face and able to manipulate others by pointing at them. After losing the power of the "Stone of Heaven" within him to revive Shadow Moon, Darom is reborn as Grand Mutant Darom (大怪人ダロム), a trilobite-like creature. In this form, he can discharge laser beams from his fingers and use his feelers like ropes. Following Baraom and Bishium's death, Darom attacked the ex-Shonen Warriors until Kotaro arrives and fights Darom until Shadow Moon arrives, killing Black and sending Darom to find his corpse to obtain the Kingstone. Darom finds Whale Mutant's cave and learns that Kotaro had been revived. Darom and Bat Mutant then had some Gorgom worshipers capture Whale Mutant as bait for Kotaro. After Black threw himself in front of Whale Mutant, he then used his King Stone Flash to deflect Darom's attack before killing him with the Rider Kick.

Darom is voiced by Shōzō Iizuka (飯塚 昭三).

Baraom
High Priest Baraom (大神官バラオム) is one of the High Priest having a stone-like green face, Baraom can discharge deadly laser beams from his robotic hands. He is usually in charge of the deployment of Gorgom's Mutants. After losing his powers from the "Stone of Ocean" within him to revive Shadow Moon, Baraom is reborn as Grand Mutant Baraom (大怪人バラオム), a smilodon-like creature with tusks. In this form, Baraom can wield tusk-shaped weapons along with his natural abilities. After Bishium's destruction, Baraom trained himself to avenge her and even got the Whale Mutant to help him. Baraom started to use his super-speed to overwhelm Black before Whale Mutant betrays him. Before succumbing to the Rider Kick, Baraom mentions that Shadow Moon will finish him off.

Baraom is voiced by Toshimichi Takahashi (高橋 利道).

Bishium
High Priestess Bishium (大神官ビシュム) is a High Priestess having her face is divided between black and white, and a clear film covers most of her face. She can discharge laser beams from her eyes. After losing her powers from the "Stone of Earth" within her to revive Shadow Moon, Bishium is reborn as Grand Mutant Bishium (大怪人ビシュム), a white-haired pterosaur-like creature. In this form, she still has her usual powers and she can spin around to create twisters. When it came to the final confrontation with Black, she tried to get the King Stone from Kotaro by taking control of the mothers and capturing Kyoko. In the conflict, Bishium held Black so that Shadow Moon can shoot a beam that will rip out Kotaro's King Stone. It failed as Bishium is destroyed by that beam.

Bishium is portrayed by Hitomi Yoshii (好井 ひとみ).