Fjell

 is a cave in the Isinfier Plains of Solstheim. It's located northwest of the Tree Stone. The cave contains a few Fearsome Grahl and a chest at the end of the cave with minor loot. There is, however, a hidden chest in the form of a hollowed-out rock just behind it. An arrow made of diamonds points down at the howled-out rock. It contains various expensive gems and a bloody note from the thief that left it there for Lucian.