Fate DxD AU

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Several Caster servants had balked when he mentioned that his commands spells regenerated… until he used one up and showed them the next day that they had replenished themselves. That had to do with the mana generators that Chaldea and the Shadow Border held when they were commencing their missions to save the world.

That left him with a priceless dilemma to ponder over. He knew he could use them to power himself up and without servant support they were quite possibly his ace in the hole. Any dire situation could be turned around within a single moment. If he managed to contact Chaldea then the dilemma was pointless. If the spell did not connect him then he was down a command spell and the possibility of them not regenerating was too high to ignore.

Slamming his forehead into his pillow Ritsuka grounded his head deeper and deeper into the pile of fluff. Indecision plaguing him far harder than the promiscuous Medb or Kiara.

'Perhaps… perhaps I should figure out how my magic circuits work here.' Ritsuka broke off his worry since that was also an issue. 'I figure out that problem and then maybe I would naturally regenerate them. The mana in the atmosphere is denser than usual. Though even at my best, I only know a few runic spells, the very basics of projection, and magical storage spaces.'

Sigurd and Brynhildr immediately latched on to teach Ritsuka any rune smithing that he could possibly learn. He admitted it wasn't much though he did at the very least write them down to practice them whenever he could. With the mana density higher it might work better this time. Though the extra runes from Scathach and Caster Cu had helped simplify them it still was difficult to actually grasp the use of them. It was entirely on him though. He had always been lousy at magecraft outside of his mystic codes.

Projection was also a very narrow road for him. He couldn't actually grasp how to perform it either. Even with Emiya showing him the basics it didn't do much for him since the best he could ever get were daggers… which shattered within seconds. It wasn't something reliable to use in combat. Paper items were easy so he could probably forge things though Emiya had put a stop to that quickly. It wasn't a heroic pursuit though he did note that in specific circumstances it was acceptable.

Magically storing items was much easier to grasp since Medea was the one who taught him. Circe also helped though there had been moments where she pulled him into one of those storage spaces… for intimate reasons. Medea usually stopped her before anything could happen but she was very persistent. Still he figured out how to actually perform said magic and started storing all the craft essences that he had acquired through his summoning experience. That included several hundred Black Keys, Azoth Blades, Hydra Daggers, and more. In truth, only the weapons were useful since Ritsuka could use them for defense in a pinch. The craft essences that portrayed people were used more with his other training.

Fumma Kotarou had taken it upon himself to teach the very basics of ninjutsu with Kato Danzo being much more thorough in her teaching. He did manage to learn to switch himself with craft essences for quick escapes. Though he liked being equated to an actual shinobi rather than something seen in anime. Kotarou had been heavily disappointed in ninja portrayal in modern media. He had screamed that someone wearing orange was never going to actually be a shinobi without narrative causality bending over backwards to kiss its own ass.

There were other lessons as well. All royalty regardless of their demeanor ordering… nay demanded Ritsuka to immediately learn how to be a ruler. There were so many conflicting lessons that it gave him a migraine just remembering them all. He didn't remember half of what they wanted him to learn since Caster Gil and Nero went the path of selfish desires, Iskander poised conquest and camaraderie, Ozymandias explained to make all worship him, Artoria emphasized living for his people though not all versions agreed with her.

He wrote them all down within one of the three small journals he had on him at all times. At the moment the small tome with magic formulas and runic application was open before him. He needed to remember if he needed any components for the Magecraft he was taught which luckily he didn't need anything at the moment.

The last journal… was a comprehensive tale of his entire journey. It had been magically lengthened by Da Vinci to record more. At the time, Dr. Roman had voiced concern about such a written record but it was so well hidden most of the time that it only became a concern when the Clock Tower Magi came to check on Chaldea. It also held several detailed accounts of every Heroic Spirit that had been summoned to Chaldea.

With a deep sigh Ritsuka returned back to his studies. There was nothing feasibly simple he could do at the moment until he had finished figuring out how well his own magical circuits could handle the new mana density he was in.

Rias was a proud devil lady. She would never stoop to spying on her new ally unless something really warranted it. This was one of those times. During the night she felt something happen in his room.

It was faint but some time during the night a barrier appeared around him. It caused her no small amount of concern. As soon as she saw it she was ready to blast it with her Power of Destruction. She only stopped when she noticed that he was sleeping soundly. She took a moment to really examine the barrier finally noticing that it felt like his mana. Relieved, she went to her room for her own well deserved rest.

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