purpose for which a stone is used

Exploration Stage: Crystal Mine
From: Kira Woodville
Description: Miners used the crystals they dug up on a daily basis. If this is the case, collectors must surely have used this ore that we are interested in for something. Come to think of it, I saw many helmets with the example ore on them that had fallen off. Is it possible that one of them belonged to a collector?
Completed: This is indeed a collector's helmet. See, here are his initials! You see the ore on it. lAs soon as I picked up this helmet, I heard a voice in my head... whispering something terrible. Is it possible that the collector was unaware of the ore's evil properties and was unwittingly influenced by them?