

When scouting, eventual secret rooms will appear along a corridor their position will be indicated by a golden star icon.

To enter a secret room, it has to be scouted first and it must be critical scouting only. As for every item providing loot, additional items are awarded if opening it while at low or zero light level. Secret rooms will always contain a unique curio: the Ancient Artifact, which will drop a small quantity of valuables or, if opened with a Skeleton key, will provide several pieces of loot similar to that obtained when defeating The Collector, hence why the Artifact is regarded as containing "Great Treasures".
