It's says that you unlock more free Crest Stones based on your past playthroughs, how does this work exactly?
On my current NG+ I got the
Ice, Snow, Thorn, Bloom and Dark (AKA the lost Crests)
Light, Earth, Water, and Wind (4 Saints)
Sky - Crest of Seiros, I'm guessing because I finished Edelgard's route the first time through.
Do you get Grim for doing BL and Star for doing GD?