I played Persona 3 uncorrectly. As in, I was 90 when I fought Nyx.
However, like everyone here, I got charm'd.
I fully healed Her on one turn, and I Black Viper'd everyone to death.
5 turns later, I was at 1 hp, thanks to my spirit bracers, and somehow managed to snap out of the charm. I killed that son of a bitch only to be eliminated immediately a few arcana swaps later by an instant killed spell.