The person is very sneaky and didn't leave any clues, other than the treasure chest loot.
First chest has five black orbs that immediately ascend into the roof. They're low-gravity orbs (one's Helene likely mentioned). They make gravity feel like a joke to anyone who's holding them. Holding multiple at the same time is risky, but they won't do anything weird if they're in a box like the one they flew from.
The second chest has just a single book, full of studies related to gravity and an explanation of the orbs. But it's in a language that's hard to decipher like this. Still, it has the imagery of the orbs so it's probably related right?
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First chest has five black orbs that immediately ascend into the roof. They're low-gravity orbs (one's Helene likely mentioned). They make gravity feel like a joke to anyone who's holding them. Holding multiple at the same time is risky, but they won't do anything weird if they're in a box like the one they flew from.
The second chest has just a single book, full of studies related to gravity and an explanation of the orbs. But it's in a language that's hard to decipher like this. Still, it has the imagery of the orbs so it's probably related right?