If your answer to this is 'well someone will beat your group', the question is 'why?' Are they better? What if we're the best around? Are they more relentless? Are they going to keep throwing themselves at us until we are Corrupted ENOUGH that they have a chance? Corrupted enough that it 'recruits an army'? No prob. The question isn't 'will we fall', it's 'how many have to suffer before we fall?'.
But that's the same answer to the whole BH system, which is one of the reasons I suggested what I did.
In your example, nothing would prevent you from going unpunished, mainly because your whole group of friends is ready to go corrupted for you. But how many such groups are there? Especially considering that with each kill you'll get more and more corruption (either on one player or several).
And I can't really answer that question because my experienced is too skewed towards a much less punishing system, so it was completely fine to PK some randos that came to punish our previous PKing. Ashes will definitely be way harsher in such situations. And if I understood your Elite example correctly, it'd be way more punishing than that game too.
Another solution to this I could see is victim-dependent stat dampen, where each PK on the same person would either give them much higher defense against their PKer or the PKer itself would be weakened against that particular target. Though I dunno how hard would it be to code that. And this still doesn't solve the issue of group PKing, but that's a whole different beast bordering on harassment.
Just to be clear before I get a bunch of responses about how I don't want PvP or want the corruption system changed (not necessarily at you entirely).
I don't care as long as Intrepid's goal is achieved. I would be fine if they change their GOAL too. If they make it so that the idea is simply 'hey if you are low level and don't have friends, you should never attempt any open world gathering if you don't wanna be ganked'.
I'm saying 'I am okay with a game where low level players are explicitly told by the system to not even try'. So I honestly don't see Corruption as important. It's probably gonna do exactly what it is meant to do and stop some of the more pointless PvP. I feel it's better for the entire atmosphere, the entire FEELING of the game to be clear to the casual player from the start.
If your goal is to have PvP players who have the skill to dominate situations and fight a lot, Corruption is practically pointless except for 'killing people much below you'. If your goal is to encourage an environment where PvE players have reason to accept PvP and learn to PvP better, there are better systems to achieve this than the Corruption one.
I'm looking forward to TL because it has an interesting twist. No Corruption at night. Good for RP. Hopefully it's terribly crippling in the daytime. That way players can literally go 'oh I'd better get home before it gets dark and random murderhobos start coming out of the forest'. That's gameplay.
If people are willing to take massive exp debt (cause afaik they still get it) to 'raise my Corruption score high enough to actually see me die and suffer for killing them' then they can bring it on.
But you asked' how many such groups are there'.
According to what I understand from MY side of the world... 40% of players will be willing to do this if they are relatively confident that their group will win. As the game goes on, this number rises because players in these groups enjoy the PvP more, expect it more often (from other similar groups) and therefore become MORE incentivized to fight.
This is anecdotal ofc. Could just be the communities of gaming I hang out in. But if you're betting on the 'percentages' and not 'the Corruption system' itself, then there's nothing specific for me to add. I hope Intrepid gets their goal. If their goal is that my group can kill whoever we want and the consequences eventually happen after doing this about 10x, that's fine. If it is that we have to worry about it racking up after flattening the group that comes after me a few times, also fine.
If they DON'T want this to happen, they have 3 more test sessions to figure out a way to make me stop doing it.