Chaos Legion

Clear stage 11 for alternate stages (#1 to #11). These stages replace the previous stages you've played, with new items (notably Thanatos Crest pieces) in some stages.

Clear the game on Normal or higher difficulty.

Beat the game once to unlock Hard Mode at the difficulty menu.

Clear Stage 9 (do not return) with Arcia to acquire the Map Selector item, allowing Sieg to replay cleared stages for items and experience.

To unlock Super difficulty, beat the game on Hard.

To unlock the Ultimate Legion, collect all nine of the Thanatos Chips scattered throughout the stages.