That Time I Got Reincarnated as a Slime: Tensei shitara Slime datta Ken

[Ryllharu]

Most people are being given an instant, painless death from Megiddo. So there is a clear contrast to the deaths of the assholes that were maintaining the two magic fields, the Otherworlders, and the general army.

Benimaru killed them all with fire, sliced them and burned them alive as they were still dying, the dragonewts did too, with plenty of stabbing in between. The female dragonewts ninja-wired them painfully to death, and the last team just viciously cut them all down.

We can assume, as Geld inferred, that the last guy (now dead and possessed by the wizard) will die significantly more painful deaths. Especially regenerators. Geld was just beating on the guy, then letting him heal for a few seconds. But what if he healed up in pretzel shape? The asshole Cavalry leader with the wizard will also die painfully, I'm sure, since the former is the one who directly killed Shion and was openly attacking children, and the wizard's nefarious trap magics were just witnessed by Geld and Hakuoro. Both of those two are part of some shitty evil plan to harvest Otherworlder's skills (which is some shady-as-fuck shit, and drastically more evil than what Rimuru's folks are up to).

I think MFauli has it all wrong. The wizard and the cavalry guy are the "comically evil" badguys. They summon and harvest children from other worlds to take their unique skills.

As for Rimuru, he's killing most with a merciful, single, swift strike. The first few thousand died without really having any idea what's going on at all. After the first 5,000, the remaining ones are only now starting to realize that people are dying around them. But even they are dead before it fully registers.

There's 15,000 to go. We haven't even seen the rest of the slaughter yet.

Worth noting that Rimuru cast an anti-magic shield, and is inside it casting Megiddo. They've hinted visually at what it really is.