(Risa POV)
As the World Language announced Geld's evolution to Demon Lord, Geld did it too.,
"RAAH! I am the Orc Disaster, the devourer of all! I am Geld! The demon lord!"
I was the first one to spring into action, pulling the Solslicer out of my Stomach, with Sol inside. Then, I unleashed a slash at Geld's neck, lopping it right off in a golden light.
"My god." Hakuro muttered beside me as Geld's head fell to the ground for a moment. Then, the body picked it up, and a yellow mist reattached it, good as new. Ultraspeed Regeneration. On par with Big Bro and mine, at that.
"Risa! Stay back and charge up a strong attack! The rest of you, hold it in place!" Benimaru immediately ordered. Shrugging, I decided to follow their instructions.
In perfect sync, Benimaru and Hakuro lopped Geld's arms off while Shion took his attention full on with a clash of blades. Seemed about even, but only for a moment, as she was pushed back due to her lesser mass.
So, basically this thing had the strength of Shion and the healing factor of a slime… Great. But it also didn't have any arms, and Soei had captured it in some sort of bind. "NOW! HIT IT WITH EVERYTHING!" Benimaru shouted, landing on the ground. I followed his instructions. Holding the Solslicer out in front of me, this time I shot my Sun-Cutting Art out like a cannon, rather than as a shockwave. I figured that, if I could cut through his neck easily with the one slice, then I'd be able to completely destroy him with a cannon-like blast. Ranga and Risa followed up with their own special skills, Dark Lightning and Flame Howl, respectively. When the lights and smoke cleared, though, Geld was still standing.
His skin was just… gone You could see his internal organs, and bones, most of which had been destroyed too, and there was a giant hole in his stomach, but with his insane healing factor, he could heal in a few seconds no matter what damage he sustained, even from my own Sun-Cutting Art. (Though, the Sun-Cutting Art did work against the Regeneration for a moment before it was overridden.) Even Big Bro looked horrified by the fact that the Orc Disaster was still standing. That blast might very well have been enough to destroy Big Bro, after all.
After casually eating a volunteer Orc General, the Orc Disaster began to regenerate like a yellow slime once more.
…
(Rimuru POV)
I looked at the Orc Disaster in awe. I was pretty sure that I'd have bitten the dust with an attack like that, but I could tell that not only had he survived, but he'd even gained Flame Resistance… or maybe something stronger(?) from the experience. Even if he was only alive right now because of his huge body, the fact that he'd managed it was a terrifying thing. From what the Great Sage told me, if Risa's full power couldn't kill Geld, then none of my heat-based attacks were gonna work, either. Nor would Dark Lightning. I still had a few attacks that might work, but it was pretty clear that unless I instantly destroyed the Orc Disaster, just a 'bit' of damage would be useless.
… Wait. He called himself the devourer of all… Instant destruction…?
'Notice. This is not recommended.'
Do I have another choice?
'You could-'
Guarantee that it won't make the bastard stronger.
'...'
Yeah, that's what I thought. I'll be fine, Great Sage. You worry too much.
'...'
…
(Risa POV)
"I've got this, guys. Stand back." Big Bro walked up to the mostly healed Orc Disaster casually. You could barely tell how terrified he was, as he gave his next instructions. "If I can't do this, Risa, execute plan B." He called over to me.
The fight that happened next was one for the history books.
Pulling out the longsword that Kurobe had made him, Big Bro strolled up to the Orc Disaster casually, and was immediately met with a meat cleaver dropping down at him.
Big Bro responded to the meat cleaver with his sword, using the Black Snake's breath to eat away at the aura covering Geld's blade while sending sonic vibrations through the steel. It only took a few clashes for the Orc Disaster's blade to break in half, so the pig discarded it and began relying on its body and skills alone.
…
"Come on, Big Bro!" I cheered. Big Bro and the Orc Disaster had been fighting for almost an hour now. Every time Big Bro's sword made contact with Orc, whatever it touched would either stop working temporarily, imbued with some combination of poison and paralysis, or simply explode, imbued with sonic vibrations, but the pig was still fighting strong despite, the overall damage being about even to the damage that his annoying Rot aura did to Big Bro.
But finally, it happened.
The Orc Disaster grabbed hold of Big Bro in its hands, stopping his motion in midair. I could feel the hearts of all our allies around me stopping, as Big Bro lost his mobility, his biggest advantage. The only reason nobody screamed, charging in recklessly, was because Big Bro told us not to. He had a plan, and we trusted him.
"Ha! You have lost! Now, you will be eaten!" Geld shouted, concentrating his Rot around Big Bro's prone form.
But Big Bro had one more trick up his sleeve. His ultimate.
"I suppose you didn't know… but I'm a slime." And from there, Big Bro dissolved in the orc's hand. He was trying to use his Predator skill on Geld, to eat him.
'Notice. Individual Rimuru Tempest has acquired Demon Lord Seed. Due to Individual's Unique Skill: Predator assimilating Sub-Skills Receive and Provide from Unique Skill: Ravenous, in order to evolve into Unique Skill: Gluttony, Individual Risa's Unique Skill: Processor will evolve into Unique Skill: Curiosity.
I knew immediately when Big Bro had won the battle and eaten the Orc Lord. Instantly, my skills received a massive upgrade. Basically, Big Bro had gained the ability to transfer 'copies' of his skills over to anyone connected to him, and his Great Sage knew that my Processor could take advantage of that. Wait, not Great Sage anymore. I could sense that it'd copied part of Curiosity's abilities into itself, evolving into the Unique Skill: Wise One.