Chambers of Xeric
The Chambers of Xeric is a scalable encounter in that the team's stats and party size upon starting the raid will determine the strength of enemies and quality of resources found inside. Captain Rimor can be spoken to scale the raid appropriately if no one is above level 115. Each raid consists of three floors; two floors of randomly-generated rooms and the last floor which contains the Great Olm, the final boss of the raid.
There are three layouts that the host can choose from: normal, large or full sized raids. The first two floors consist of seven rooms which consist of the entrance, exit, resource room, one or two scavenger rooms (with a minimum of one large scavenger room for two scavenger rooms) and 2-3 combat/puzzle rooms.
Guide, gear, inventory, locations, pictures and money making rates from the OSRS Wiki (CC BY-NC-SA 3.0).