Sword Of The Purgatorium

Sword of the purgatorium, not to be mistaken by the purgatorium from star ocean: First Departure, is a blade hidden in a treasure chest 200,000,000 years ago by the lord of chratze (The island of despel's core) whatsoever, it can be obtained by the pirate, but requires him/her to be a master swordsman/girl.

History
Once chratze was defeated,45 years later inferno's hideout was finished, they discovered a mysterious black blade in a chest sealed insisde the the iceberg of darkness. That's when it was robbed, but when the robber died, his son kept it in a loot pouch. However...

Sword Recovered By A Rune
After his son died, a rune called marsha crept into the hideout and found his house but with it, the sword of the purgatorium. She used a time gate her mother built to send it to our time. Thats when the sword of the purgatorium became a legend.