vincent1202
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That would be a high risk high reward for Raijun, he could just say "no" and that's it. Voiding the contract, on the other hand, is low-moderate risk high reward for him.
considering that he could do it passively, i think there is no reason to dedicate time to make it a separate domain. Whether it is technically a domain or he didn't know it was called a "domain technique" when he created it, it already functions as a domain
i think health potion just provides the nutrients and the brain has to allocate the nutrients to damaged area
probably against endurance/recovery types? most of them are slow and rely on mostly heavy passive defense. Average hits don't work, resonance sound attack might work but if the healing factor is high it would be hard to win unless he 5-stacks 3 times in a short period of time