Sorry, I've only just finished the northern cave but I'm missing weapon #10. Any ideas where I can find this?
Also, and this is a pretty n00b question, but what's a good strategy for using all my sands and the crystals? I've only upgraded Effat, Harty, Viper's main skills, but i'm sort of afraid of wasting the crystals on lesser skills. Also, what's a good use of my diffuse crystals and duplicate crystals?