I don't.
Unless the person I'm roleplaying with mentions them, I simply reference training as a way of explaining certain skills my character has. To me, soulstones are an example of story and gameplay segregation. They exist for the player as an achievement, but have little necessity for the roleplayer. I find backstories of a character's experiences far more interesting than defaulting to "a magic stone granted me POWAH!"
Way I see it, provided you aren't breaking established lore, go about it however you like.
Unless the person I'm roleplaying with mentions them, I simply reference training as a way of explaining certain skills my character has. To me, soulstones are an example of story and gameplay segregation. They exist for the player as an achievement, but have little necessity for the roleplayer. I find backstories of a character's experiences far more interesting than defaulting to "a magic stone granted me POWAH!"
Way I see it, provided you aren't breaking established lore, go about it however you like.