My favorite place to solo for pp was the grimling caves in The Tenebrous Mountains. They are usually empty nowadays. Gems and runes sell to vendors for a decent amount. You can sell the acrylia ore in the bazaar. Also, the Grimiling Runner drops his pack, which you can use to make the rallic pack. Depending on how fast you kill and how much the ore sells for on your server, you can make a great deal more than soloing HGs in the same given time.
Good luck.
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