Operation Righteous Strike

Operation Righteous Strike (セイギのイチゲキ作戦) was Elpizo's ideal large scale frontal assault on Neo Arcadia, taking advantage of X's absence.

Background
Elpizo, formerly known as TK-31 which was working on Neo Arcadian Bureau of Administrative Services. Having such authority, through many times, he have discovered lots of secrets about the Project Elpis and learnt true purpose of him, and began questioning very own existence. Later, Neo Arcadia later turned their back on innocent Reploids, labeling them as Maverick and push them out of the place from Copy X's order. In the meantime, before the execution were performed, a surprise assault from the Resistance interrupted everything and only left TK-31 with his best friend, HE-22 flee the vicinity.

Elpizo began developing hatred and vengeance upon his homeland, preparing for an assault strike someday, in order revenging Neo Arcadia for all the sake fallen Reploids. Walking through the sewers, they talk about joining the resistance, TK-31 agrees, but he insists that he first has to go to Area 7 to retrieve the Baby Elves (though he only obtains one). From that point on, he insists on being called Elpizo, all only for the future purpose of the assault.

After the events of Copy X, Elpizo helps the resistance build a more advanced new Resistance Base. He becomes Commander of the Resistance Forces, through appointment by Ciel, as she wishes to focus on her energy research. Upon becoming commander, he begins planning "Operation Righteous Strike", as he believes the only way to save Reploids is to destroy Neo Arcadia. He concedes, however, that if Ciel finishes her new energy system, he will cancel "Operation Righteous Strike" for her sake, but is not convinced that her plan would work.

Climax
Elpizo kept on gathering soldiers and training them in order for the unseen consequences like he would, despite Ciel's words tried desperately to tell him not to, but it's all useless. Several months later, Zero returns to the Resistance, totally a stranger to Elpizo. However, they both gaining trusts in each other despite rather not relates well outside. With Zero's return, Elpizo feels bold enough to execute his beloved plans, which ironically the only thing Zero didn't follow, and Elpizo stays at the base commanding, leaving them leaderless. About 40% of the soldiers were adapted into this assault, with most cutting-edge weapons, their best sub-commanders and so on. The main objective was about to deal a large blow as fast as possible in the main district of Neo Arcadia, thus should heavily damage them in the battle and leaving the warning message from the Resistance as expected.

The force arrived in time and dealt some serious damage to the land forces. However, still unseen to Elpizo, the only force which he doesn't expected to fight against were the three remains of Four Guardians. Created for the purpose of protect the people and Neo Arcadia's mainland, they arrived in almost no time after hearing the alarms about the assault strike. Shortly after, all of them wears heavily packed armies and turn the tide against the opposite force, and later terminated every Resistance human force seen in sight, despite they fought bravely to death believing in Elipzo's words. The mission was totally pummeling resulted in all the brave soldiers sacrificed, none of them survived and left a big hole in the remaining forces, as well as his very own pride.

Epilogue
Elpizo's dream is dashed. Unable to deal with the death of the resistance fighters, Elpizo began to frustrating himself deeply and gaining insanity. He decided to left the base and Ciel in command. He leaves a message where he curses his lack of power as the reason he failed as a commander, so he decides to awaken the Dark Elf in order to completely wipe out Neo Arcadia and all of the humans, creating a "paradise" for all Reploids.

After releasing and absorbing the long-time sealed Dark Elf, he was still subsequently defeated by Zero. While dying Elpizo apologizes for his actions claiming if Zero hadn't defeated him he would have "done something unforgivable", but the Dark Elf, turning good for a brief moment, transformed Elpizo into a Cyber-elf. Before he flies away, he openly states that the Dark Elf "wasn't completely evil" before disappearing for good. With the now unlocated Dark Elf, the world is at threat once again.