An optional room of which you can battle more powerful versions of the bosses in the past.
Class 1: The Bandit King χ - LV Requirement: 12
HP: 60
POW: 4
DEF: 4
Max SP: 12
Class 2: Bedrock χ - LV Requirement: 22
HP: 70
POW: 8
DEF: 6
Max SP: 18
Class 3: Satan χ - LV Requirement: 35
HP: 300
POW: 18
DEF: 16
Max SP: 36
Class 4: Chaos Core χ - LV Requirement: 50
HP: 1
POW: 1
DEF: X
Max SP: 58
Boss Cheat: Eternalization - DEF is X = the amount of enemies x25 (max 75)
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(To be continued)