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One Rank Higher
Defeat the One-Armed Bandit after activating one Chip Defense Machine in Liberation of Undermine on Normal difficulty or higher.
One Rank Higher requires you to defeat the One-Armed Bandit in Liberation of Undermine on Normal difficulty or higher after activating at least one Chip Defense Machine, which is done by picking up a chip from the casino floor in The Gallagio and turning it in at the room just before the boss.
Collect a Chip in The Gallagio
Before reaching the One-Armed Bandit, search the floor of The Gallagio casino area for chips. There are four available: Red at 80, 55, Blue at 66, 29, Purple at 58, 49, and Gold at 66, 80. Only one chip is required for this achievement.
Turn In Chip at The Lucky Heart
Bring your collected chip to The Lucky Heart, the room directly before the boss room, and activate the corresponding slot machine. This counts as activating one Chip Defense Machine.
Defeat the One-Armed Bandit
Enter the One-Armed Bandit encounter and defeat the boss while the Chip Defense Machine remains active. If you picked Red, avoid the large fire rings it adds to the fight. If you picked Blue, watch for silence-causing shock waves. If you picked Purple, stay away from the boss to avoid 80% healing reduction. If you picked Gold, be aware the boss has increased HP.
Tips
The Red chip at 80, 55 is recommended if you are working toward the Glory of the Liberation of Undermine Raider meta-achievement, as its fire ring mechanic is the most straightforward to manage.
See the video guide for a visual walkthrough of chip locations and the slot machine activation room.