Assassin, Caster and Siren

Mordred is upset with Shiro for not calling her for help goes off on her own and encounters Assassin and Caster. Plus a female Kamen Rider known as Siren appears.

Disclaimers: I own nothing

"Here I am at Ryuudou Temple", Mordred said with her Clarent Sword in her hands.

Early after the Rin Tohsaka issue and the brief battle with Kamen Rider Strike, Mordred becomes upset with Shiro for not calling her for help like he should have. Later after learning of Caster's and Assassin's location at Ryuudou Temple, she suggested that they should attack now but Shiro said no and with that Mordred decide go off on her own without him.

"Hello there Saber, I am Sasaki Kojiro summoned to the Holy Grail War as the Assassin-Class Servant and I guard the temple gateway", Assassin out of nowhere introduce himself to Mordred.

"Let's do this then Assassin", Mordred gets her Knight Helmet on then charges at Assassin locking their Clarent Swords and Katana Swords together.

"Oh I was summoned to the Holy Grail War by Caster, I know what your thinking but Caster can do that because one of her Noble Hhantasm is called Rule Breaker and her real name is Medea", Assassin reveals what Caster can do even revealing her real identity.

XXX

Inside the Temple

Unexpectedly Rider/Medusa breaches the temple's perimeter but moves out of the way when she gets attack by skeletal beings called Golems. Rider/Medusa swiftly destroys them with her punches, kicks and her Chain Blades.

"Well now you confront me Rider", the Golems creator Caster finally shows herself, violet colored circles appears behind Caster and fire lasers at Rider/Medusa who evades them but Caster continues to repeatedly shoot more lasers at her.

"Your completely outmatch Rider", Caster said to Rider who couldn't even get close enough and attack all because of those lasers.

XXX

Emiya Residences

"Where is Mordred anyway?" Shiro ask his mom about Mordred's whereabouts.

"If you want to know Shiro she went to Ryuudou Temple on her own because she is had it with you and your pacifist ways", Shiro's eyes open wide like dinner plates after his mom answered his question.

"I gotta go!" Shiro grabs his Advent Deck, his helmet, bike keys, gets on his bike and hurry to Ryuudou Temple to help Mordred.

"Does he need any help?" Len ask Irisviel if he needs help.

"No he'll be fine."

"If you say so Irisviel."

"Although I might need to help Shiro because I can sense another Kamen Rider as arrive on Earth."

"Earth Kamen Rider?"

"No Ventara Kamen Rider and it's a she."

XXX

"Kamen Rider!" Shiro morphs while driving his bike the same way Len did right before they met, unknown to Shiro another Kamen Rider who looks entirely female watches him from the building rooftops after she defeats a Tera Biter Mirror Monster.

XXX

"Tsubame Gaeshi!" Assassin uses his Noble Phantasm on Mordred but she evades it but that leaves a scratch on her armor.

"Yikes! I need to use whatever Mana I have to prepare my Noble Hhantasm", Mordred say to herself now planning on putting her Noble Phantasm to use.

While she was doing that Rider use this as an opportunity to escape when this outmatch battle with Caster went too far for her to handle. Rider retreats from the temple leaving Mordred alone to fight Assassin, Shiro who is already near inserts a Advent Card into his Dragon Gauntlet, plus Mordred Noble Phantasm is interrupted by him.

Strike Vent

Drareder appears and shoots flames at Assassin which caused a big amount of damaged on him but doesn't kill him.

"Dang Dragon!" A fried Assassin cursed before retreating from the battle, Mordred collapses from a lack of Mana that was wasted.

"Time to come home Mordred", Shiro carries her to his bike and rides home.

XXX

"Why do you keep telling me not to fight Shiro?" Mordred regains consciousness while riding with Shiro who was still in his Dragon Knight form and ask him why wouldn't he allow her to fight.

"Because I don't want to see you get hurt", the conversations comes to a halt when out of nowhere Shiro's bike gets pulled into the mirrors to Ventara along with them in it.

XXX

Ventara

"Oh great, are we in Ventara now?!"

"Yes we are Mordred, it seems somebody didn't want us leave right now without a fight", Shiro looks around for any sign of Mirror Monster or another Earth Kamen Rider.

"GAH!" Shiro was hit by an Advent Beast that resembles a Swan causing him to fall off his bike along with Mordred.

"Shiro a female Kamen Rider", Mordred said while she helps Shiro up.

"I am Kamen Rider Siren", Siren attacks both Shiro and Mordred, apparently she thinks they are working Xaviax.

"Hey wait were not enemies here!" Shiro trying to convince Siren that they are not enemies while Mordred protects him using her Clarent Sword to block Siren's Twin Blade Sword.

Sword Vent

Shiro grabs his Broadsword and defends himself from Siren who is not listening to a word he says, Mordred kicks Siren on her right hand causing her to drop her Twin Blade Sword before Shiro super kicks her in the face. Then Siren counters by drop kicking both of them before retrieving her Twin Blade Sword by kicking it up in the air with her feet, but before she can attack again Len arrives and comes to Shiro and Mordred's defense.

"Len?" Siren said surprise to see him.

"Kase", Len said next.

"Len who is this?"

"This is Kase, she's the original Ventara Kamen Rider Siren", Len answered Shiro.

End