This page contains Eternal Sonata Hints for Xbox 360 called "Secret Dungeon - Mysterious Unison" and has been posted or updated on Mar 25, 2008 by vhayste.
- Developer: Tri-crescendo
- Publisher: Namco Bandai Games
- Genre: Role-Playing
- Release: Sep 17, 2007
- ESRB: Teen
Secret Dungeon - Mysterious Unison
In the last desert area in chapter 7, head east three times to reach the oasis. There will be an item there as well as a large door. After the battle with the Ruined Body (2nd to the last boss), you will receive a Hero's Crest. Use it on the door to open it and unlock the archievement.
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