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Tip for farming, since the old spots don't work anymore: going to Hell by sleeping in the bed at the Sanzu River lets you battle a set of hell fairies, and by defeating Clownpiece you can talk to her and set the difficulty higher. It's more efficient than the old E4 method for leveling, because the puppets you fight are level 95.
GengetsuS at level 100 can oneshot everything in the first fight. Give her a Green Mark and Deadly Arts for a held item, dump all her PP into Speed/Focus Attack and use a moveset of Ephemeral/Evil-Crushing Arrow/Lightning Cut/Earth Sign. Works like a charm.