From Alathra Wiki

Copium is a substance created by the Dwarves of Bal Duran for agricultural purposes, using it as a form of fertilizer to allow the growing of crops in the underground city that the Dwarves lived in. For a Dwarf, Copium is a normal every day product like fertilizer, not causing the high that it does for the Kogongi or other races, and as such was produced in massive quantities with the purpose of agricultural development, allowing the city to growing extremely quickly.

Symptoms: Dizziness, Numbness, Short-Term Memory loss, and Possible instant-death via overdose.