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Suggest also a suitable name as replacement.
Orc's Soul Stone => Orc's Ghost Stone
Orc's Spirit Stone
Demon's Spirit Stone
Maybe it could be Orc's heart, Esoteric's heart?
or 'Effigy of Esoterics/Effigy of Orc, Esoterics' Monolith/orc's Monolith
Change word "soul" into "bio", for example "Orc's Bio Stone". Simple and self explanatory in my opinion