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→ You must have exactly 23 minutes to open the chest. To get 23 minutes you can head right to [2,6]. There will be two clocks that look like sundials on the map; "Clock That's 7 Minutes Fast" and another that is "2 Minutes Fast". Use the "7 Minutes Fast" clock three times, and the "2 Minutes Fast" clock one time to obtain a total of 23 minutes. Return to the chest and open it.
These fights must be done alone. You will be attacked by 4 Gonebyways monsters with their lvl scaled to yours, in a wave format. 1st wave consists of 2 monsters, then 1 more monster appears per each next wave.
Right after this fight you will start a second fight automatically; you can use any food you have to heal before the fight starts. You will have to kill 3 Gonebyways monsters with their lvl scaled to yours. You will be assisted by Belle Adrenne's Krosmoglob (monster) with its lvl scaled to yours during the second fight, but it isn't very helpful outside of being a distraction. It can inflict a tiny bit of damage but should not be counted on to do anything useful. The death of Belle Adrenne's Krosmoglob (monster) doesn't affect the fight.