Growls of annoyance came from the green gem as Ddraig digested that information. Junichiro let him do so for a bit before he continued, "Of course, that's only the beginning really. From what I understand he has complete control of Divine Dividing. And I do mean complete. He already has mastery over the Balance Breaker and can activate Juggernaut Drive without any consequences. He is, by far, the most powerful and potent user of Divine Dividing, ever."
Okay, so that might not be strictly true right at that very moment. He was certain that Vali would have control over his Balance Breaker by now, but it was still two years until the canon began so he might not have full control of Juggernaut Drive. He just didn't know, but it would be one hundred percent true in two years so it's not like it truly mattered that much.
There was silence for a long while before Ddraig spoke once more, "I see. If you are telling the truth about my original holder, I can see how he would have been easily crushed."
"Don't forget what would happen to anyone you were sent to after his death. Vali will be around to taunt and destroy your wielders for thousands of years. Provided he doesn't get killed, of course. But given his strength, it's highly unlikely."
"That doesn't tell me why I should approve of you as my partner."
"Good point. So, let's talk about me. First and foremost, I'm an Artificer. So, while my personal strength is only around a Mid-Class Devil, I have the ability to create any magic items I might need to give me an edge against my enemies. I already possess the Sacred Gear Sword Birth and have unlocked its Balance Breaker, so I'm experienced with Sacred Gears."
He dug in his pocket while speaking and retrieved his cigarette case. After selecting his desired smoke, he stopped talking to stick it between his lips and light it. After a short drag he continued, "I currently have the heiress to the Gremory clan of Devils vying for me to join her peerage, so I will become a Devil. I'll have the same life span as Vali with the added benefit of being significantly smarter than him. From what I hear, he's a bit of a meathead, always looking for another fight."
Junichiro exhaled a massive cloud of smoke before he concluded, "I can also swear to you, on my very life, that I will become the most powerful Red Dragon Emperor to ever walk the Earth." His grin practically turned feral, "I can't speak for your past users, but I see so much unbelievable potential in your boost ability that I can't even properly articulate just how broken it is in power."
He seriously believed it too. What many people seemed to overlook is that Boosted Gear doubled the users power with every use. But power is such a vague word to describe such a potent ability. His scans had shown him the true scope of what Boost affected. That being the entire body, both physical and metaphysical, of the user.
Makes sense right? Issei used boost to get faster, stronger, tougher, and even increase his pitiful magic reserves to something usable. Why else could he only use spells like Dress Break after boosting a couple of times? The price was the users stamina. A very fair trade and stamina was the only thing not improved by boosting.
Yet there were small details, little things that could be so heavily abused. For instance, with all physical attributes boosted, so too would the healing speed of the user. On it's own, that doesn't seem like much. After all, a simple small cut would take days to properly heal, for a human. Boosting and doubling healing speed doesn't seem all that impressive. A cut that would take four or five days to heal would instead heal in two or so, if the boost was maintained regularly.
Or something more serious, like a hairline fracture, would take approximately seven weeks to heal. Cutting that in half isn't much, at all.
Until you change it from a normal human into a devil that heals faster and add in more boosts. While it still might not reach Wolverine levels of regeneration without a ton of boosts, even just a few would be a major help. Especially if healing magic of any kind was added to the mix.
Why did any of this matter? Gainz bro!
In all seriousness. Being able to boost magically assisted healing to be more potent to heal the micro-tears in muscles after working out would allow someone to get significant results in a protracted amount of time. Junichiro could go from his currently rather fit body to one that looked like it was sculpted from marble in a ridiculously short time. Add in a Devil's inherent ability to be stronger than humans without gaining huge mass and it would allow him to become crazy strong in an extremely short time frame.
Ddraig laughed for a bit at the mention of the potential of his boost ability. Some of his users had comprehended some of it, but it was very rare for someone to comprehend all of its many facets. Most were, as Junichiro said Vali was, meatheads. They would focus on the immense physical strength boosting provided and not much else. Occasionally he had a wielder that could use magical attacks and would focus on boosting that aspect of power. He could not specifically remember any who used both aspects at once, usually just the utility of either aspect to enhance the other.
"I see. Perhaps you will not be such a terrible partner."
It wasn't like Ddraig had any particular attachment to whomever his previous host had been. They'd never even met! He honestly doubted he would know that Junichiro wasn't his original host if he'd awoken already bound to the boy.
Junichiro seemed interesting enough to Ddraig and it wasn't like he had any real say in the matter. Even without his cooperation, Junichiro would be able to use all the primary aspects of his Sacred Gear. The only thing Ddraig could do was override some of the safeties temporarily and turn parts of his body into dragon equivalents.