Douluo: Yuhao with a 10000 Times Return System!

Bei Bei had to admit... bringing Yuhao to the Soul Guidance Department was his best and worst idea.

"Brother Yuhao, this is a Level 3 Soul Guide, the Milk Bottle—an energy restoration-type Soul Guide..." He Caitou was introducing Soul Guides to Yuhao, who now had stars in his eyes, acting like others his age... except if that glowing, huge red blade wasn't in his hands—a Flame Blade Soul Guide that could reach temperatures up to at least 500 degrees Celsius...

"...Brother Caitou! Why not install this Milk Bottle on the blade? So it can be used without wasting our own Soul Power?" Yuhao asked, and He Caitou wanted to refute it—then paused, because... it was theoretically possible.

"Brother Yuhao, give me around half an hour." He Caitou said as he placed the Flame Blade on his workbench and disassembled it. He first began modifying the Core Array carefully to draw the Soul Power from the attachment and also from the user in cases of emergency. Caitou was using a carving knife to carefully work on it. Twenty minutes later, only part of the new array was done—as one had to be extremely careful or they could mess up the Core Array...

"Brother Caitou... can I ask you something? Is the engraving of Core Arrays difficult because you're afraid of making mistakes?" Yuhao asked, and He Caitou nodded. Although it wasn't exactly correct, Yuhao was basically right.

"Don't resist." Yuhao said as he activated his Soul Skill: Mental Detection Sharing. He Caitou felt something entering his mind—and he didn't resist it. His vision changed to a 3D view of everything, with even the smallest movement clearly visible.

"...Brother Yuhao... no, Big Brother Yuhao! Please join the Soul Guidance Department!" He Caitou fell to his knees dramatically as he hugged Yuhao's thighs. This was a golden—no, a goddamn immortal thigh! If he, Caitou, had Yuhao's help, he could even make Level 4 Soul Guides! Thinking of Yuhao, who was the original user and whose Martial Soul was probably his eyes, this Yuhao had the posture of a Ninth-Level Soul Engineer!

...

A few minutes later, Bei Bei and Yuhao finally managed to pull Caitou off of Yuhao's legs.

"Okay! Okay! Brother Caitou! I'll join the Soul Guidance Department but..." Yuhao said, then rubbed his fingers and thumb together in that all-too-familiar gesture.

"Understood, Big Brother Yuhao! I'll make sure you get the treatment you deserve!" He Caitou promised. Normally, even if he saw Yuhao's Soul Skill, he wouldn't be that surprised to call a younger boy 'Big Brother'... but who told this guy to have such unorthodox and innovative ideas for Soul Guides?

"...Um... so, about my Soul Guide?" Bei Bei began.

"Wait a minute! Let me see if the modification works!" He Caitou interrupted Bei Bei and began to work on the Soul Guide idea they'd discussed before, with Yuhao's help. Forty minutes later, the completely modified and connected Core Arrays of the Milk Bottle and Flame Blade, along with the inner and outer shells, were all put together.

This was merely a prototype and an impromptu modification based on ideas—not the actual product—but their idea actually worked. The blade began to function after He Caitou pressed a button and injected some Soul Power into that area, which activated the stored Soul Power in the blade... if not for the only issue, which was the rapid leakage of Soul Power from the Milk Bottle, which could at most power two attacks before running out.

"...I wondered why no one mentioned this idea... maybe because they've already tried it and failed." He Caitou sighed, slightly disappointed but not too much.

"...Brother Caitou, since the main issue is leakage and timing, why not turn it into a burst type? Like, it can do one extreme attack using the energy stored in it. That way, even if it's wasted, the energy won't be completely useless." Yuhao asked, and He Caitou was stunned before promptly getting to work again.

Twenty minutes later, looking at the reassembled Flame Blade, He Caitou activated it using his own Soul Power. Normal Level 3 Soul Guide drain, normal heat levels of a Level 3 Flame Blade... and then he pushed a button and injected more Soul Power into it, pushing it into an extreme state. The temperature, which had been around 500 degrees, shot up to 800 degrees as the flame turned a dull, cherry-like red for a few seconds. He Caitou slashed at a wooden dummy, which burned, ignited, splintered, and charred—making the dummy catch fire.

The blade instantly returned to its dull red of 500 degrees in temperature, but it seemed a bit damaged too.

"Ha—Hahaha!" He Caitou laughed. This was merely a prototype, but it worked! If modified and properly made, this attack could be improved so the Soul Guide wouldn't be damaged, and even the temperature limit of the burst could increase.

"Bei Bei! Come on! Let me measure you for making the Soul Guide!" He Caitou said after putting away the new blade. He took out measuring tape and began measuring Bei Bei's arms, and also made Bei Bei show him his fighting style. Although he was reluctant, he did so under the burning gaze of Caitou—who observed him perfectly with Yuhao's Soul Skill cheat-skill.

"So... how should we make it?"

"What about a gauntlet like we said earlier? But with retractable claws, and also somehow make the claws spin... after all, spinning can drill, right?"

"Hm... that's possible. It'll be hard to have enough energy though..." Caitou said.

"What if you just place multiple Milk Bottles? No one said you could only have one."

"...Oh! I think we can instead make an energy burst that stabs the claws like a projectile!" –Caitou

"Why not both? A spinning, stabbing claw!" –Yuhao

"Hm... how about we add paralysis poison to the claws?" –Yuhao

"Poison? That's a good idea! We can also add small-scale sharp wires coated in that! It can bind and paralyze the enemy too!" –Caitou

"How about adding smoke bombs to the palm area? But also add paralytic poison to that too!" –Yuhao

"Let's make it detachable too! So the poison wires can be separated from the user, allowing him to keep moving without being interfered with!" –Caitou

As these two kept discussing more and more wretched ways to deal with enemies... Bei Bei felt he had made a grave mistake introducing Yuhao to the Soul Engineering profession.

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(A/N: LADIES AND GENTLEMEN! Like I have said earlier! Give me new and innovative ideas for future chapters, as I already said, I have lots of stuff planned out but still, I could use the inspiration from many people to modify and improve my fanfic! I request you all to bestow upon this poor writer your wisdom, my Lord Readers!)