The heroes investigated the fighting at Imani's tower and discovered a number of orcs battling a berserk flesh golem. After dealing with the monsters, the adventurers learned that another group of orcs has fled with the Diamond Staff of Chomylla, the elven artifact and key to the hidden vaults of Uvaeren. The pursuit of these orcs led north through the forest on the very eastern edge of Battledale, and ended at a bramble-choked ravine. At the end of the ravine, a dark cave mouth is half blocked by gnarled tree roots and moss. The area is marked by many tracks and strewn with discarded bones and rotting refuse. A trace of dark smoke escapes from the cave mouth and vanishes into the mist above.
From what Imani told you of the Staff, it had protective wards on it that should have kept all but the most skilled arcanist from seizing it. He believes more sinister forces are at work here.