[ As they go, Arenvald adjusts his glow accordingly, a spot of brightness and warmth in the frigid depths. (One day, he’s going to have to thank Astoria for this power. Even if they haven’t found much, he certainly feels useful, which is a lot for him.) ]

Hm. I would think because someone doesn’t want others to find “the important stuff”. What better way to deter people, right?