Rave Master Vol 30

From the Tokyopop edition

When Sieg's plan to protect the final Mother Dark Bring from Lucia doesn't go exactly according to, well, plan it becomes more important than ever for the five RAVE Stones to be reforged as one. But when Elie taps Resha's memories for clues on just how to do this, the whole gang finds itself in a new pickle. A new pickle that is, in fact, a very old pickle. Fifty-two years old to be exact. Can they experience the history of RAVE's creation without mucking it up and destroying all existence?

Source: Anime News Network Encyclopedia