The Ancient cavern is accessible after certain progress with the barbarian training. To enter, you must either dive into the whirlpool south of the Barbarian Outpost, use a Ferocious ring to teleport next to Kuradal, or teleport there through the Fairy Ring network using the code B-J-Q, provided you have repaired the Fairy Ring beforehand using a Spade and five Mushrooms. The cavern is home to many powerful monsters such as the Mithril dragon, which drops the infamous Dragon full helm. The cavern has also become home to the Slayer master Kuradal, who has a special dungeon full of many high level slayer monsters.

Lower Level Barbarians (Level 132) Brutal green dragons (Level 227) Skeletons (Level 132) Spirits (Level 166) Waterfiends (Level 115) Upper Level Abyssal demons (Level 124) Blue Dragons (Level 111) Dark beasts (Level 182) Gargoyles (Level 111) Greater demons (Level 92) Hellhounds (Level 122) Iron dragons (Level 189) Mithril dragons (Level 304) Steel dragons (Level 246)