Clearing Corruption

Death removes a certain amount (currently unknown). If you have a ton of it - you'll need more than one death. I do believe the wiki mentions that.

And so far there's been no indication that a friend can't just kill you. But the death penalties apply. You gotta remember, the only true corruption-related penalty is the stat dampening if you have a ton of corruption.

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I'm not sure if I understand what exactly you're implying. Death penalties will be huge either way, so it's not like your friend killing you would change anything, so it doesn't really need to be changed (though I'd prefer that friends couldn't do that).

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Yes, the experience debt is the penalty for death. Any death.

Stat dampening is a separate additional penalty for when you have a ton of corruption on you.

These are 2 different penalties.

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The stat dampen from death penalty is related to the XP debt, because you "lose lvls", while corruption's stat dampen seems to be a direct stat reduction related to the amount of corruption you have.

Same in effect, but different in the reason for it.