Think of this as a what if scenario. Yes, it could lead to a possible future but with an alternative sequence to how things could go. We already know of Mamiya's origin as he is originally Riku, the now former adopted son of Touma Kamiyama. What would happen if Mamiya would return as Falchion. here's how I would put the story together.


Biography: After restoring reality back to its original stasis and becoming a human without the memories of what he did as Falchion, Riku's path led him to a peaceful and quiet life as a Novelist that he dreamed to be, just like his former adoptive father. As another year passed on with the Sword of Logos continuing their duties and employment, Riku had felt that he wanted to do even more deeds like Touma had. So he kept training himself to become a powerful swordsman like Touma.

After some time, a fragment of Charybdis Alter Ride Book had restored itself to its original state and evolved into a more powerful Alter Ride Book that also gained a new form. Later on, the swordsmen noticed its revival and proceeded to eliminate it. Sadly, they were not strong enough to do so and it failed their mission. Riku asked if he could fight as a swordsman once again, but Touma put off the idea. In a rush of events, the Charybdis Megid had arrived into town, and Touma and the others ran to save the people. Unnoticing the fact, Touma had accidentally dropped the Amazing Siren Wonder Ride Book. Riku picked it up immediately as a wave of memories had collided with his.

During that time, the Swordsmen banded together to fight the now currently evolved Charybdis Megid, even with the use of the Haouken Xross Saber, it still wasn't powerful enough to defeat it. The Charybdis had then sucked the sword entirely as it evolved into what it called itself Charybdis Haou. Riku quickly ran towards the swordsmen and flew his fist into the Megid, but didn't stop the Megid from attacking as it pushed Riku away. As Riku got back up from the Charybdis' attack, Touma noticed that Riku was holding onto the Wonder Ride Book had he had dropped when pursuing the Megid. Riku then vowed that he would turn his former hatred into the power that he desperately needed and use it to defeat the Megid. The book started to glow as it summoned the Mumeiken Kyomu and the Haken BlaDriver as if it heard Riku's voice. Riku then used the items to transform into Falchion once more.

After successfully injuring the megid, the swordsmen had decided to train him as the recurring swordsman of the abyss. Yuri didn't accept this fact considering his history with the original swordsman that used the Mumeiken Kyomu before him, but accepted it anyways to help gain a new ally on hand. While the megid had returned, Riku and the others transformed once more to defeat the megid. In the miraculous attempt, Riku had pulled out the Haouken Xross Saber from the megid. As he pulled out the Haouken, the sword had glowed along with the Amazing Siren as the sword had created a new Wonder Ride Book for Riku to utilize known as the Immortal Phoenix. Riku then passionately proclaimed that he will use this new power to create a miraculous story of his own and transformed into Kamen Rider Falchion Immortal Phoenix.

As Riku used his new be founded power, he used it wisely to attack and defeat the Charybdis Megid. As he successfully won, he sent the remaining fragment back to the abyss as it would continue to remain there. As Riku reverted back to his original self, it cause his body to deteriorate and vanish. But before he did, he gave the Immortal Phoenix to Touma as it too reverted back into the Amazing Siren Wonder Ride Book. Riku had disappeared along with the Mumeiken Kyomu and the Haken BlaDriver. A week had passed, Touma and the others celebrated the loss of their new beloved friend and worth swordsman. However, it didn't stop as Riku was revived the same way Touma had. Everyone had cheered victoriously for Riku's resurrection as the book and the seiken had gave him the ability to revive once more. Touma had then gave the Amazing Siren Wonder Ride Book back to Riku as he proclaimed that the book will continue his new story and begin a new path as a swordsman.


Warning: The Design of this Minecraft Skin was created by ROBUKOFU under the titles, Kamen Rider Espada Arabiana Night and Desast with Mumeiken Kyomu/Falshion . Do NOT give me credibility, other than the recolor of majority of the suit and the small detail to the helmet that is resembling Falchion.

Note: This is not a new character, but an original character and one of the users who has used the same technology. I felt that since Bahato has now departed from his duty as a swordsman, and with Desast currently being his own rider now. I figured that Mamiya would be more suitable to carry on as the Third Falchion. They did specify that the adult Riku Mamiya had become their own entity at the end of the V-Cinema Film.



===Transformation Sound (English)===
Immortal Phoenix! There once was an ultimate beast that united with the blade of abyss to create a new story!

Eternal Abyss Unsheath! An eternal soul shall arise from the ashes! Immortal Phoenix! Forever More!


===Transformation Sound (Romanji)===
Emōrutaru Fenikkusu! Katsute, mu no ken to ittaika shite atarashī o tsukuridasu kyūkyoku no kemono ga monogatari!

Nagafuchi Battō! Hai no naka kara eien no tamashī ga umareru dasu! Emōrutaru Fenikkusu! Fōevu~ā More!


===Transformation Sound (Japanese)===
エモールタルフェニックス！かつて、無の剣と一体化して新しいを作り出す究極の獣が物語！

永淵抜刀！灰の中から永遠の魂が生まれるだす！エモールタルフェニックス！Forever More！



===Finisher Sound (English) [​w/ WRB & Seiken inserted]===
Immortal Phoenix Final Reading! Immortal Phoenix Deadly Strike! Eternal Abyss!




===Finisher Sound (Romanji) [​w/ WRB & Seiken inserted]===
Emōrutaru Fenikkusu Hissatsu Dokuha! Emōrutaru Fenikkusu Hissatsu Geki! Nagafuchi!





===Finisher Sound (Japanese) [​w/ WRB & Seiken inserted]===
エモールタルフェニックス必冊読破！エモールタルフェニックス必冊激！永淵！




===Finisher Sound (English) [​w/ Seiken removed]===
Immortal Phoenix Final Reading! Immortal Phoenix Deadly Strike! Eternal Abyss!





===Finisher Sound (Romanji) [​w/ Seiken removed]===
Emōrutaru Fenikkusu Hissatsu Dokuha! Emōrutaru Fenikkusu Hissatsu Geki! Nagafuchi!





===Finisher Sound (Japanese) [​w/ Seiken removed]===
エモールタルフェニックス必冊読破！エモールタルフェニックス必冊激！永淵！







===Finisher Sound (English) [​Hissatsuholder]===
Nothingness Drawing Sword! Silent Reading Flash!





===Finisher Sound (Romanji) [​Hissatsuholder]===
Kyomu Iai! Mokudoku Issen!





===Finisher Sound (Japanese) [​Hissatsuholder]===
虚無居合！黙読一閃！






What does the transformation look like: Just like Bahato and Desast who transformed into Falchion, Mamiya would also use the same transformation but with the Phoenix that comes out of the book to be orange, black, and gold.

What does the finisher look like: Considering that Falchion has multiple and different varieties of finishers. When using his sword to perform a Rider Slash, it would actually summon multiple phoenixes that would charge the enemy in battle. When inserting the Mumeiken Kyomu into the Hissatsuholder to perform another rider slash, it would be exactly identical to the majority of the Saber Riders who uses said Holders to perform said finisher. When pressing the cover of the page to perform a rider kick, it would summon both Falchion and their enemy into a black void that would be surrounded by the gigantic phoenix which would help perform Falchion's Rider Kick.

Sound Origin: The sound is based on Espada's Final Form, Arabiana Night. This would also include that additional sound when pulling the sword out, and the finisher sounds as well.