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Kilieit · **06-29-2016, 07:37 PM**

As far as I can tell, yes to all.

I don't know the past FF references (my only FF game was the original Crystal Chronicles for GameCube...), but:

Soul Crystals are used in training people in Jobs because they make the learning process faster. Every time you gain a new ability during 30-50 job quests, there's a flavour text describing how the ability was revealed to you by the stone.
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In several of the 30-50 job quests, you are granted visions of the Crystal's previous wielder; and, sometimes, that vision can speak. This may be in part due to a manifestation of the Echo (remember that all of the canonical quests are presented in the context of the player being an Echo user), but off the top of my head, I can think of the DRG 50, SCH 50, and some of the WHM 30-50 quests that do this.
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Additionally, I believe that several Soul Crystals have canonically been mistaken for regular gems, or fitted into artefacts. BLM and PLD sprung to mind.

I'm sure someone else can come in with a loredump and proper citations for most of this, but that's what I got off the top of my head. :3

Soul Crystal/Soul Stone Lore