What with "DRK must be punished" mindset? I hope you don't forget that we're looking for a "fix".
Try to add more problem while solving a problem can hardly solve anything.
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It's not "punishment" it's resource management.
Or are you going to complain about TBN costing MP too?
Without any kind of draw back, LD would be unequivocally the best invuln in the game.
It's basically a Holmgang with an up to 10s buffer.
My suggestion would have the same effect as LD, but give you the ability to mitigate the drawback.
So then why does your proposed "fix" still have a 50% healing requirement instead of 100%?
That's still a cost, they still die if that 50% healing isn't met.
You're not fixing the problem, why are you only advocating for a half-fix if the idea of any cost is wrong?