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After saving the huge crystal inside of Glutton, which I'll most likely use in something else, I continued my shopping spree, looking for compatible materials for my familiars evolutions.
I got myself a variety of the rare Spirit Stones, which were available. The rarest of them were usually Earth, Darkness and Poison, the forest had those ruins where I found Nephilim, which were filled with spirit stones of mostly life, nature, fire, and light elements.
Meanwhile, the Fishman King's Dungeon had Spirit Stones of Ice and Water, and sometimes fire too, but Earth, Darkness and Poison were still the rarest, so I made this opportunity to get a bunch of those.