Are you kidding? We literally have a dedicated page explaining how demonic energy works and that demons can use their powers and increase or decrease their stats with it, and that it's even their life force. I've already given you two examples of cases where demonic energy increases regeneration and allows healing. It's up to you to prove that there's another unknown source of power for demons besides demonic energy.
Humans + demon energy = no healing
Demons + not even a body = regeneration
V + demons + shared demonic energy source = demons regenerate but V doesn't
This points to demon physiology being key here, not just energy.
As I already explained to Tanin, and as I explained to you above, Vergil didn't fully regenerate from that attack (either due to a regeneration negation or due to a regeneration limit caused by stamina, literally the point of our debate); that's literally why he lost against Dante and Mundus.
This means he was weakened, not that he wasn't regenerating. The two aren't a 1-1.
Vergil wasn't split in two because that obviously wasn't Dante's intention—to do what Sukuna did to Gojo, lol.
I don't see what's so complicated about that.
You're looking at this scene where he wasn't cut in half when he was cut clean in half with a sword, and you're saying it wasn't because he has regeneration but because Dante didn't want to cut him in half when he slashed clean through him? A big blade slashing through him doesn't open him up a d somehow that's because Dante didn't want to open him up?
Do you realize that this case completely contradicts how Dante's regeneration works, regeneration negation, and stamina-related regeneration? Dante is stronger than Abigail, so there was no reason for him to have been affected by regeneration negation, and he wasn't tired, so there was also no reason for his regeneration not to have worked.
We literally see Abigail overpower him in their first encounter, and he was still stronger in their second, until Dante used DT. Obviously Abigail was superior enough to base Dante to overwhelm him fairly easily, hence the regeneration null. Considering Abigail isn't even tired at all after their first fight, this is consistent.
It's just a minor inconsistency that doesn't change the debate and proves nothing, since Dante wasn't even affected.
This is an assumption on your part. You have a hypothesis, that regeneration is tied to stamina. You point to cases of attacks from stronger or equal characters downing characters who have regeneration, with no proof of wounds staying unhealed either. Such things happen to Wolverine and even Majin Buu, so this wouldn't be enough to give the regeneration a weakness, let alone one that's literally designed to basically make the regeneration worthless.
Even from the evidence we would have several possible outcomes, one being that the characters being downed has nothing to do with regeneration, as is the case with all the other regenerating characters who get knocked out by lesser injuries than they should shrug off. Normally that would be the "inconsistency".
Assuming the regeneration was weakened, we'd still have two possible reasons based on the situation: that the character was tired or that their attacker was stronger or comparable to them. Convenient in theory, given that in the vast majority of cases these two would both be true. The character wouldn't be tired by a weaker character after all.
That's why this instance, where a character is not healing while having plenty of stamina, seems like a tiebreaker to me.
The fact power null is well established in the verse already and other characters can regenerate without even a body or mind, also supports this.
There was no visible regeneration because it's just an inconsistency, it proves nothing.
Convenient to dismiss the evidence that doesn't fit your existing hypothesis. We don't get to dismiss this blatant scene just because we don't like it, especially when what you're weighing it against is actually far less explicit showings of the regeneration not sparing them from being knocked out.
Abigail wasn't stronger than Base Dante, otherwise the latter would not have been able to stand up to him and would have been defeated before transforming.
... So a small power difference automatically equals not enough time to transform? There's a very important difference between stronger and one-shotting, it's literally an issue that underscores the entire versus thread subsection here, and exists in just about every battle series.
Furthermore, by taking into account this argument and this inconsistency of Dante not regenerating in a few seconds from Abigail's attack, you are contradicting yourself:
During his first fight against Vergil in DMC3, Dante lost because he was impaled and unable to regenerate, due to regeneration negation as it is currently accepted, because at that point Vergil was stronger (as was already quite clear a year earlier in the manga). But the problem is that Dante wasn't defeated at all when Abigail impaled him during their second round; Dante continued to fight as if nothing had happened, which completely contradicts everything we saw in the fights between Dante and Vergil in DMC3.
Dante was defeated the first time, he needed Patty to save him, and even afterwards he was weaker than Abigail until he DT'd. In addition, being defeated or not isn't the key. Both situations the attacker was stronger than Dante, both instances they could harm him through his regeneration in some way. The case where he explicitly isn't healing also happens to be the case where he still had plenty of stamina.
You don't get to dismiss that scene just because it clashes with your hypothesis. When one makes a hypothesis then examines the evidence, the hypothesis is supposed to adjust to fit the evidence, not the other way around as you're doing.