Advent Master Eubulon
Eubulon, known as the "Advent Master", is the creator of the Kamen Riders from the Planet Karsh. He once worked with General Xaviax to create a machine to transport a large amount of people from other planets starting with Ventara. He had a change of heart in this plan and created the Kamen Riders to destroy the machine. He created a Kamen Rider just for himself and has the power to change the DNA sequence of the Rider Decks so anyone can use it. He fought Xaviax to a draw and ended up being found in Roswell on Earth. He warned the No-men of Xaviax upon his arrival but was injured badly and was unable to tell them anything else. 60 Years Later, Len was brought in to reactivate Eubulon. Len had informed him about Adam's betrayal and of Xaviax's activities. With Xaviax on the move, he reassigns the Siren deck to Maya as she helps Len stall Xaviax as Eubulon goes to retrieve the Riders in the Advent Void. He manages to bring the Ventaran Torque, Strike and Axe (named Chance, Price and Hunt respectively) as he and Len explain their current situation to them. He gives them a device that will upload a virus in Xaviax's transportation devices as they will need some of them to retrieve the people of Ventara. Eubulon goes back to the Advent Void to retrieve other Riders, including Kase and Kit. When he brings them out of the Advent Void, he gives Kit the Onyx deck to help out Len, Chance and Price. After returning to the No-Men's base, he begins repairing the key in order for it to fully function again, before sensing Maya in danger and sending Kit to assist her. When he senses Kit and Adam fighting each other, he interrupts their battle in order to hear out Adam's side of the story and prevent Kit from giving into anger. He brings Adam back to the base to hear him out, but the other Riders are not interested. Len leaves the base but Eubulon follows him and manages to have the others trust Adam, if only slightly. He goes with Price and Hunt to locate another transmitter but have a difficult time searching for it. After being ambushed by monsters Eubulon retreats when Hunt gets injured. He begins to heal Hunt when they return to base. Eubulon, while meditating, is met up by Kit and Maya who ask him of the origin of the Kamen Riders. He tells them that he himself is an alien as well as someone who worked under Xaviax. He tells the history of Karsh that it is a war-torn world and Eubulon was enlisted to create a transportation device to send a mass amount of people as slaves to rebuild their world. He explains that he was taken in by a Ventaran family and decided to rebel against Xaviax not wanting to enslave a peaceful planet. Thus he gave the Ventarans the Rider Armor to defend themselves and the Ventarans selected twelve of their very best to take up the mantle of Kamen Rider. Later, Eubulon discovers the reactivated transmitters. When Adam and Len return, Adam tells what happened to him and Eubulon reassures him that it was a trap set up by Xaviax. He sends the Riders along with Trent and Maya to Xaviax's base and hands them each a Link Vent card which, when used by all 13 Kamen Riders, will combine all 13 Final Vents and unleash it into one devistating attack. When the Riders destroy the shield generator, Eubulon manages to stop Xaviax right before he activates his transmitters. This leads to a battle between the two of them with Xaviax gaining the upper hand. He is saved by the two dragon Riders who, along with Len and Kase, distract Xaviax long enough for Eubulon to bring the remaining six Riders from the Advent Void. Soon enough, all 13 Kamen Riders use their Link Vents and destroy Xaviax once and for all. Eubulon states that their work is far from finished and together with the other Riders, manages to bring back the people of Ventara. During the Epilogue, he seperates and retires Adam from the Dragon Knight deck and gives it to Kit Taylor, who has officially become Kamen Rider Dragon Knight. Using his technology, he continues to help rebuld Ventara and continues to assist the Kamen Riders from any more evil that may threaten Ventara and Earth.