Complete the "Firmament" level with the Handmade Necklace equipped.
Fight True Final Boss
Beat Firmament for the second time with the handmade necklace equipped.
Unlockable
How to unlock
Broken Necklace
Beat Firmament with Handmade Necklace.
Handmade Necklace
Collect all 7 jewels hidden in various stages and talk to Joule.
Handmade Necklace
Collect all seven hidden jewels then speak with Joule.
Lumen Audiolocket 1-7
Upon cashing in 3000+ or more Kudos via a checkpoint or offensive skill, a special pendant will become available to be synthed. When equipped, it will cause a specific Anthem to be played instead of the usual randomized track.
Unlockable
How to unlock
Audiolocket 1: Beyond the Blue
1st Sumeragi.
Audiolocket 2: Nebulous Clock
Subaquatic Base.
Audiolocket 3: Azure Door
Media Tower.
Audiolocket 4: Pain from the Past
Biochem Plant.
Audiolocket 5: Scorching Journey
Datastore.
Audiolocket 6: Rouge Shimmer
Stratacombs.
Audiolocket 7: A Zip to the Moon
Pharma Lab.
Special Missions
After beating the true final boss, you'll unlock a series of four gauntlet-style special missions. They feature many more enemies than those found it the regular stages, combined layouts of certain stages, and lack checkpoints.
Mission
How to unlock
Special Mission 1
Beat the true final boss.
Special Mission 2
Beat the true final boss.
Special Mission 3
Beat the true final boss.
Special Mission 4
Beat the true final boss.
The Dullahan
After beating all four special missions, you'll unlock the Dullahan, the final weapon in the game. It fires much stronger bullets than the other guns, but is incapable of tagging enemies for electrical attacks.
Best Ending...