Disk Vol.11 "Pinnacles"
From Ephinea PSO Wiki
"Pinnacles" was created by Rynn as part of the Japanese Blue Burst servers one year anniversary celebration. Community members were able to submit songs to officially be included in the game. "Pinnacles"received an honorable mention in the contest. Rynn's submission described the song as, "Ever since the contest started, I envisioned writing a fast-paced track, since there aren't many in the PSO BGM soundtrack. The name comes from a real place with strange rock formations in Australia that I think has a similar atmosphere to Episode 4".