Re:Zero The Fall Of The Four Demon Gods

Brutal Training

After explaining everything to Yoshiro he had decided to take both Kajah and Subaru to the dimension where Lunanie sends her mages and wizards to practice their magic.
They began training and it wasn't like anything they had done before. Emilia has to be escorted out do the how bad Subaru was getting beat. He would damage Subaru to the brink of death but then heal him before he dies and reset as Yoshiro is aware of his ability. For Kajah he's forcing him to use both weapons in his god form no matter how drained he gets. This has caused him to almost pass out several times. Not to mention he's doing all this in his basic human form with his right arm only.
Subaru: *GAH*
Kajah: *deep breathing*
Yoshiro: Subaru you now know your considered a disciple. In order to awaken your potential your gonna have to suffer. As for you Kajah, you will overcome that power strain. The god form you have is powerful but useless if you can't maintain more that 30 minutes. The goal is unlimited time for you. Now then try again both of you.
Kajah: r-right.
Subaru: *wipes blood from lip* grrrr HAAAA!!!
They try over and over but the results are the same.
Yoshiro: *sigh* you two are gonna help me huh. Not looking promising anymore now is it.
Subaru: tisk
Kajah: *deep breath*
Yoshiro: hm?
In that moment a power surge over care Kajah allowing him to unleash a catastrophic attack. His eyes cold and lifeless.
Yoshiro: *ngh* (not good.)
Kajah quickly warps towards him. He quickly draws one of his normal katanas only to have it shatter. He gets his distance and began using spells. They To are useless against Kajah in this blank cold state.
Subaru: This is...like that time he lost control. (No...this is different...it's like...he's stuck in some trance.)
Yoshiro: This kid...he's not even awake. In that case allow me to wake you up.
Subaru: CRAP!
Yoshiro: Demon Order Yoshiro Masamune.
Subaru stands in fear an amazement as he could sense the immense power difference.
Subaru: wh-what is th-
Yoshiro: Observer Subaru and remember. I am your enemy still.
Because he doesn't want to destroy Kajah's new demon weapon he decides to use his hands covered with a strong layer of mana. Kajah swings causing a shockwave on impact.
Subaru: WAAAAAAAH!!!
The gust of wind blows Subaru a great distance. Then Kajah is hit once in the stomach knocking him out.
Yoshiro: Not bad kid.
He looks at his hand and sees that it's bleeding a little. (Not bad at all.)
Subaru comes back amazed by what just happened.
Subaru: Y-You actually stopped that?
Yoshiro: Yes now I need to help you awaken more of your abilities. I will find out what will trigger your latent power.
Subaru: H-how?
Yoshiro: I will have to give you more pain than normal I see.
Subaru: What?
Yoshiro: Hmm That's right. Kajah has achieved his strength through suffering and anger.
Subaru: What are you gonna do?
Yoshiro: I'll be right back.
Subaru: what? Where are you going?
Yoshiro: Ava.
Ava: Yes?
He whispers to Ava and she looks nervous but then nods and teleports.
Kajah still weakened from over using his form looks confused.
Kajah: What...is he...doing?
Subaru: I have no idea. How are you holding up?
Kajah: Heh...I can't move a single muscle. No matter how much I try.
Subaru: Jeez he really isn't playing around. I thought Alex was bad...this is just-
Before he could finish Ava and Yoshiro return but with Emilia is with them.
Subaru: Huh?
Yoshiro: Now then.
Subaru: Hey...What's Emilia doing here?
Yoshiro: Lets get your blood boiling. Subaru: H-hey...that's not funny.
He draws his blade by Emilia's neck.
Emilia: S-Subaru.
Subaru: HEY CUT IT OUT!!!
Kajah: H-hey...stop this...Yoshiro.
He slits her throat causing blood to flow out.
Subaru: EMILIA!!!
The entire time Subaru didn't notice he cut her throat using Limbo.
Subaru: BASTARD!!!
He lunges at him with all his rage. Yoshiro easily blocks it but, he is slid back a little.
Yoshiro: (Hmph Good. And he's too mad to realize she's still alive. I cut her throat but using Limbo to prevent her from bleeding out. Long as I'm keeping her neck frozen in time.
Subaru: GRAAAAAAAA!!!
Yoshiro: Yes that's the rage I'm looking for.
Subaru's mana began to go out of control. Then it started taking shape around his body.
Subaru: YOU'LL PAY!!! YOU'LL PAY!!! ILL KILL YOU!!!
Yoshiro: Good you're welcome to try it.
Once Yoshiro lured Subaru far enough, Ava came and healed Emilia's throat allowing him to stop using Limbo's ability.
Ava: That was great Emilia.
Emilia: ...I don't like it. He's in so much pain now because of this...it's not right b-but...if it's the only way he won't die then...ok.
Ava: Mhm Yoshiro knows what he's doing.
Kajah: H-hey...what's going on?
Ava: Now for you. Emilia can Puck come out?
Emilia: Right. Puck we need your help with something.
Puck: *appears and stretches* How May I be of help Emilia?
Ava: Are you able to tap into someone's mana?
Emilia: Like how you did for Subaru. Something close to it at least.
Puck: Hmmm let me see. Eh? What happened to him?
Kajah: Used up...literally everything...can't move.
Puck: Well that makes my job easier. Let's see what you got.
Putting his tail on the downed Kajah he looks within him to see about his mana situation. However when he does he finds himself within the mind of Kajah.
Puck: Huh? Wait...where am I? He looks around to see a clear blue sky. A large mountain with a beautiful waterfall.
Puck: I'm beyond confused. Emilia? Ava? Anyone here?
Then a small figure appears by the water.
Puck: Hm? What's that? HEEEEY YOU THERE!
The figure goes behind the water fall. He fallows but stops by the flowing water.
Puck: Wait...this-this isn't water. ITS MANA!!! A-all this? All this is his mana? Then...what's behind this mana fall?
He flies through the flowing mana and is met with a large cave opening.
Puck: ...ok I'm extremely confused.
He goes inside and finally reached the end. He's met with many more of the small figures surrounding a massive sleeping Demon covered in seals.
Puck: W-WHAT IS THAT!?
Meanwhile with Subaru and Yoshiro.
Subaru: GRAAAAAAAA!!!
Several large powerful lighting strikes hit around them.
Yoshiro: What?! (That was the highest level a magic spell. This has gotten promising.)
Subaru: HAAAAAAAA!!
He casts several powerful high level spells. Ice then Fire, lighting again then wind fallowed by earth.
Yoshiro: Element Emperors.
He tried matching Subaru's elements. The clashing spells cancel each other out. Till Subaru unlocks even more mana.
Yoshiro: If he keeps this up he might die from this. (I'll stop this quickly.)
Subaru: HAAAAAAAAAAA YOSHIRO!!!
Yoshiro: Hm?
Subaru with all his strength and rage combined all of the elements to create a powerful sword made from the strongest level of elements including light and dark.
Subaru: HAAAAAAAA!!!
Yoshiro: Congratulations Subaru, you have earned your Disciple form. How you're still not strong enough for me.
He takes out his left arm from his Yukata and unsheathes Armageddon.
Yoshiro: Do avoid losing too much more of your mana, im gonna have to do this Subaru.
Yoshiro: Armageddon.
Subaru: HAAAAAA!!!
In a quiet and single motion Yoshiro dashes ending up behind him.
Subaru: Gah!
Yoshiro: Sleep for now.
He slings him over his shoulder and walked back to the others.
Yoshiro: *flops Subaru down*
Emilia: SUBARU!
Yoshiro: He's fine just sleeping. How's Puck and Kajah?
Ava: They are both in some trans.
Yoshiro: I see...this might take longer than anticipated. Subaru is done though.
Emilia: Subaru... *looks angry at Yoshiro* He looks horrible.
Yoshiro:...*looks to the side* he wouldn't calm down.
Emilia: *puckers cheeks* You hurt Subaru too much.
Ava: *Puckers cheeks* you said you would hold back Yoshiro.
Yoshiro: ... I- sigh I held back. I didn't use my forms, just Armageddon.
Ava: That's still a lot.
Yoshiro: You can't be serious. In any case let's hope Puck gets out of Kajah's mind.
Emilia: What do you mean?
Yoshiro: In order for Kajah to have a more even flow of mana in his god form, he had to use up any normal and demon mana he's use to using before running out. However there's hidden mana inside of him. We cannot see it sense it like Puck can.
Emilia: I remember him saying something about it before when he first came.
Yoshiro: Really now?
Emilia: Mhm.
Yoshiro: Good then Puck should have no problems.
[Meanwhile]
Puck: These symbols...
Voice: So you're the intruder.
Puck: Huh?
A stranger walks from out the darkness of the cave duel wielding the swords Kajah owns.
Puck: And you are?
Utopia: Utopia the soul and name of Kajah's sword and his deep inner subconscious.
Puck: Mind telling me what this thing is.
Utopia: Sure if you can hit me once.
Puck: Huh?
Before He could say anything else, they were both outside standing in a pool of mana.
Puck: How did? Look im not here to hurt anyone.
Utopia: You really think you can harm me? How confident.
Puck: Well I am a- never mind that. I-
Utopia: And that's how I know you can't do it.
Puck: Pushing it kid.
Utopia: Kid? Oh no no I'm much older that you trust me. Look at the pool.
He looks at the reflection to see himself in his real for form and completely different being for Utopia. Before he could ask anything things became reversed.
Puck: The hell is goin on?
Utopia: Normal or true form. What will you fight me in? Choose carefully now.
Puck: Heh obviously my- (Wait...If I use my true form...no doubt he easily read me. So then.)
Puck: My smaller form.
Utopia: Hm wise choice.
He changes Puck to his smaller body but gives him the same strength and abilities as his larger body.
Puck: (Something tells me...this is gonna be hard.)
Utopia: Prepare your self.
Puck: Heh you better do the same. Been a while since I've let loose.

To be continued