Carved bones
On the island used by gnolls to summon demons, the party found an unoccupied bunkroom in the southeast of the mountain temple, which Anrel unlocked using the Chime of Opening. There were four bedrolls to the south and a single bed against the northeast wall. While Anrel stood guard by a set of steps leading up from the northern corner of the room, Vichthart and Grokko searched the room.
Underneath the bed to the north they found a small chest containing a spell scroll of Lightning Lure, Rrekkeh's journal, a drift globe, and a leather pouch containing carved and polished animal bones. Up the stairs to the north they found a separate bunkroom where Srir Silthallow's bed was alone. Underneath it the party found a wooden chest, which Anrel smashed open. Inside that was a Bag of Holding, into which the carved bones were placed.