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My own personal favorite place to farm these is the final boss arena. Throne Watcher / Defende or Naashandra. For one, it keeps it interesting. You never know which boss you'll be fighting (though it's usually watcher/defender). For two, there will always be players challenging the final bosses, even at the highest soul memory. And even at the highest soul memory, people will still want help with the two-on-one boss fights. Admittedly, the biggest drawback to this farming spot is the run to get there. But if you can tolerate that, this might be the spot for you.