Based on a comment from dimavt on the SoniaiItemForge mod to make the Soul Ores droppable, turned into a proper mod. Make sure it is after Soniai'sItemForge in D2RMM or it won't do anything.
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Adapted from a comment from dimavt here: https://www.nexusmods.com/diablo2resurrected/mods/243?tab=posts&BH=0
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Changelogs
Version 1.0
First version, makes them droppable, and colors the soul ore items yellow (rare).
Makes the soul ores from SoniaiItemForge drop from monsters with rare text instead of being white items that you buy from a vendor.