You must venture back into the depths of the Living Forest, and seek out Cruven's Lair. Though his magic is strong, you will see through the illusions so long as you hold alight this Lamp of Revealing. Without it, you will find yourself without the guiding light which will be necessary to see you through the journey ahead. Once you have entered Cruven's Lair, you must locate a rune stone within, which will allows us further access to his dungeon.