Alright, I tried to read through the thread, here's my thoughts
- The presence of a discussion rule on this topic is very silly- Discussion rules are something that should effectively be in place only for things that are objectively wrong but are a common misconception, not for something that the community has just agreed should be considered a certain way.
- I don't like how people just say random stuff about the opponent's argument and pretend it objectively disproves it. "argument from belief", "appeal to reality"... these aren't real things that anybody has to actually acknowledge. Generally a lot of bad faith argumentation from the opposition too. There's a trend in battleboarding communities to act as though using actual realistic logic/common sense is somehow antithetical to the "right" way of doing powerscaling and I think that should be pushed back on.
- I however also don't love Agnaa's argument of using Asriel's lightning as proof that Vulkin's lightning is not acting realistically and generally arguing that the speed could be... being made slower by Vulkin? I'm not sure I really get it, but I don't know if that should be the default assumption. I can see the idea but I think this was focused on too much and padded out the discussion a whole lot.
With that said,
I disagree with Vulkin's lightning being MHS+. If monsters have the ability to shape and control their own magic then it doesn't really make sense to assume that the lightning is actually being originated in a realistic manner by the cloud (its presence alone isn't very strong evidence: the electricity acts unnaturally the second it appears, so why are we assuming it's being created naturally?). Something that hasn't really been discussed enough is that even if the lightning as being made naturally, the fact that it's a tiny lightning bolt coming from a tiny cloud would already invalidate the validity of the feat in the first place because that just wouldn't produce electricity with that kind of speed and power (is the Underground even tall enough to host a realistic lightning cloud?).
One may argue that the 8-B rating on its own justifies the assumption that the lightning is moving at lightning speed... but that clashes with the assumption that we're assuming it's being generated naturally. To elaborate, if (1) Vulkin's lightning is 8-B, and (2) is generating the electricity in a realistic manner, then he would need a much bigger cloud to make lightning. If (1) Vulkin's lightning is 8-B and is (3) generated from a really tiny cloud, he is not generating the lightning realistically (because he'd need a much bigger one for that much energy). If Vulkin is (2) generating the lightning (semi-)realistically (3) from such a tiny cloud, then the lightning isn't MHS
or 8-B (because a cloud that size would produce a lot less electricity), and this is an anti-feat (and should either be discarded entirely, or used to downgrade the verse, probably the former in this case).
No matter what there isn't an obvious way for (1) (2) and (3) to all be true, so it doesn't make sense to say there's realistic MHS+ lightning coming from such a tiny cloud. What at best we have here is electricity being magically generated in a way that
sort of resembles how electricity is actually produced by clouds, and being
sort of like lightning does not in my opinion make you MHS+. To be very clear, this is NOT an argument about the realism of magic electricity in Undertale
*, it's an argument about how the electricity is not actually created in a way that makes it analogous to real lightning specifically.
EDIT: To quickly address the counterargument of "If Vulkin isn't generating the electricity realistically, why's he making a cloud to begin with?"... I dunno! It's obviously a reference to real volcanos making clouds, but that doesn't really mean much on its own. Maybe he thinks it's fun, maybe he needs to do it, maybe he's doing it because it's goofy and cartoony and Toby Fox thought it'd be fun, maybe there is a process that actually validates the lightning being treated as MHS+, but maybe not. We can't really know, it's pretty pointless to theorize.
* Indeed I disagree with Agnaa in regards to the feat being completely invalid. It's ultimately an electric attack with magic electricity that's
just close enough to IRL standards to be fine to use. I don't find his arguments that the electricity is being shot at sub-natural speeds to be very compelling, and I would definitely consider the feat viable to use with that value.