提案/Suggestion
Make past event stones also available with introduction of new stones. A week is a very short window to obtain gold skills. Having to wait weeks even months for it to return is madness. Make them available in subsequent driftsmelting events.
現状/Current Status
Banbaro and Black Diablos will only drop Mysterious Driftstone B (Pale Driftstones will not drop).
All other large monsters have a chance of dropping either a regular driftstone or Mysterious Driftstone B.