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Another player who was at the table during the incident sent me this meme after the problem player in question (they had a history) left the group chat.
Felt like sharing it here because I'm sure more people should keep this kind of thing in mind.
Regenerate is also a 7th level spell - depending on the setting, the number of people capable of that kind of magic might not even exist outside of the confines of the party, or if they do, they're more preoccupied with the stuff worthy of NPCs with at least thirteen class levels.