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Battlefield Echoes
"We're not at an optimal state yet, commander."
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Battlefield Echoes are a category of Lore entries. They can be read by accessing the Elmo Cloud Server Room, then the Traceback menu. Each entry must be unlocked using 
Sardis Gold and 
Collapse Pieces, as well as a specific item gained from BH stages in the Campaign.
Peace and Happiness[edit]
Unlocked with 
Handmade Lucky Knots.
Development Agreement Archived Files[edit]
Unlocked with 
Elegant Pens.