Gelmud arrives to put the invasion back on track, but he wasn’t counting on encountering anyone more powerful than he, a superior majin. While he tries to kill Gabiru, who he himself named just to be another pawn to make his Demon Lord stronger, Rimuru steps in to deflect the relatively weak attack, then tosses some potions to Gabiru to heal his fallen loyal subordinates.
Gelmud is little more than an annoyance; the one thing Rimuru wants from him is the name of the one pulling the strings, but Gelmud won’t give him up, confident Orc Lord Geld will attack on command (he named him out there in the desert, after all). Instead, the Orc Lord beheads Gelmud and eats him, after which he evolves into the Demon Lord Orc Disaster Gelmud was trying to create all along!
The Kijin and Ranga throw everything they’ve got at the Demon Lord, all but exhausting their magicules in the process, but nothing can cause anything other than light scratches and burns, and he heals almost instantly. This is certainly the toughest boss Rimuru & Co. have faced to date.
So tough, in fact, Rimuru decides to cheat a bit, by activating “Auto Mode” and leaving the Demon Lord up to the Great Sage and all her amassed wisdom. Rimuru’s eyes glow red and reflect the Great Sage’s geometric form, and starts to go to town on the Orc, culminating in enveloping it in a massive column of flame.
Unfortunately, probably since he ate Gelmud, Geld has a resistance to fire, so the big attack has no effect. Rimuru takes back control and proceeds to Plan C…pivoting from Cheat Mode to Cheat Day, as in eating way more than he should.
It becomes a struggle to see whether Geld’s Starved or Rimuru’s Predator can devour the other first. As Rimuru’s expandable slimy body envelops Geld, he can see a bit of the former Orc King’s past, when he had to pull off his arm to feed starving children under his protection during a horrible famine. He soon set out to find help, which is when he encountered Gelmud.
Geld insists he can’t lose, because he must live to bear his sins and those of those who sinned on his behalf…but Rimuru ain’t havin’ it: this is an eat-or-be-eaten world, and Geld can’t win against him. At least Geld has a momentary rebirth when his barren home is transformed into a lush, green paradise before evaporating.
The Demon Lord Geld is gone, and Rimuru and his allies are victorious. He relieves the Kijin, keeping his promise to release them from his service once they took care of business…but unsurprisingly they all want to stay by his side. I’d say it was time for a celebratory feast, but I’d also say Rimuru’s eaten enough for one day!