According to the following screenshots, demonic essence can be sold to NPC Augustin. However, I am unable to sell to him. According to this post, it can be sold after delivering 3000 for the completion of "The Dreamer's Challenge Quest", which I did.
Am I missing something?
As I said in the previous answer, you need to write "ethereal" to npc to open a trade window with essences(and soul orbs), normal trade does not show these items, same for "Gnomish" items (Golden Sickle, Orichalcum Pearl and purple tomes)
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