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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 monsters which are slightly stronger versions of the monsters they are named after, in a wave format. 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 more monsters which are again slightly stronger versions of monsters from the area. You will be assisted by Belle Adrenne's Krosmoglob 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. You will receive 1 Unstable Orichor.