The Soulcage was a magical lantern with the power to compel the soul of any being. It was granted to Sylvanas Windrunner by Helya as part of the secret deal they made in Helheim. Sylvanas used it in an attempt to subjugate Eyir in the vault of Skold-Ashil, but Genn Greymane freed her when he smashed the lantern. Afterwards, the adventurer received a shard of the lantern to empower their artifact weapon.
- As a seeming opposite to the Soulcage's abilities, the light from lanterns on kvaldir ships is said to be able to release bonds of the spirit. An adventurer used such a lantern to gather the pieces of their spirit after Helya sundered it.
Sylvanas holding the Soulcage in the Vault of Eyir.