The Raven Queen was also said to claim a domain in the Shadowfell known as Letherna, a fortress of black ice within a frozen forest through which the souls of the deceased had to pass before reaching the afterlife, according to some versions of the World Axis cosmology. The Fortress of Memories, realm of the Raven Queen in the Shadowfell. Swarms of ravens occasionally flew out of the fortress, taking her cryptic messages to the far reaches of the multiverse and acting as the Queen's eyes and ears while away. It was a place of overwhelming sorrow, overflowing with memories taken from mortals and fragments of dead deities, material objects collected by the shadar-kai and brought to her as gifts, and apparitions of creatures and places associated with strongly emotional stories. One of the Raven Queen's divine realms in the Shadowfell was a castle known as the Fortress of Memories. It was believed that her true intentions were only known to the Lady of Pain.

Others maintained that there was a cosmological function that was performed by the Queen's actions, as she purified souls by forcing mortals to deal with their fears and pains. Many sages speculated that she was in fact insane, believing her methods and behavior little more than aimless curiosity or a desperate attempt to prevent her fragile existence from fading into oblivion. The Raven Queen was obsessed with collecting and observing mementos and fragments of memories and essences. The Raven Queen did not possess or manifest a physical form, instead appearing as a miscellany of symbols, perceptions, and images.

Maps of castle ravenloft