
Just to sorta build on my claim, yeah the whole ninja soulstone seems to be commonplace and perhaps rudimentary for the user. It's in the description of the NIN soulstone that it has inscriptions of epic tales and techniques on the gem itself.Â
So on the topic of DRG, perhaps the soulstone is the key to their crazy-ass aetherpowerjumps? Like in an in-game standpoint, you can't do ninjutsus without a NINsoulstone (I'm gonna use NIN/WAR for the sake of them being the only class I maxed out past the soulstone), so maybe it's an actual lore mechanic that applies to it's user. A Warrior can't channel the Inner Beast without the soulstone (in which it describes the way of the Warrior, further implying the mastery of the Beast).
That's just my guess.
So on the topic of DRG, perhaps the soulstone is the key to their crazy-ass aetherpowerjumps? Like in an in-game standpoint, you can't do ninjutsus without a NINsoulstone (I'm gonna use NIN/WAR for the sake of them being the only class I maxed out past the soulstone), so maybe it's an actual lore mechanic that applies to it's user. A Warrior can't channel the Inner Beast without the soulstone (in which it describes the way of the Warrior, further implying the mastery of the Beast).
That's just my guess.