The Troll Stronghold is located far north of Burthorpe near Trollheim. To use this area, you must have completed or started the Troll Stronghold quest.
There are many monsters in this dungeon. The Troll Generals located on the top floor are quite popular since they drop many valuable items. On the bottom floor is the storage room which can be accessed via the stairs near the cooks. In this room is a crate containing 'goutweed' which can be traded to Sanfew in Taverley for regular herbs. Please keep in mind that you will need to have completed the Eadgar's Ruse quest to do this.
Aga and Arrg
Mountain Troll (Level 69 and 71)
Troll General (Level 113)
Twig and Berry (Level 71)