Soulcage

The Soulcage was a magical lantern with the power to compel the soul of any being, owned by Helya. On the orders of the Jailer, Sylvanas Windrunner traveled to Helheim and made a deal with Helya for the lantern. Sylvanas was to use the artifact to take control of Eyir and force her to deliver her Val'kyr to Helya, who would in turn corrupt them and bring them over to the Jailer's side. Helya was initially reluctant to part with the Soulcage, until Sylvanas pointed out that the deal would benefit Helya as much as it would benefit the Jailer. Sylvanas subsequently tried to use the artifact to subjugate Eyir in 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.
• Although the Soulcage was introduced in the expansion, Helya's motives for giving it to Sylvanas were not revealed in the expansion itself. At BlizzCon 2019, lead narrative designer Steve Danuser stated that players would, in the expansion, learn what the bargain between Helya and Sylvanas was as well as the Soulcage's true purpose, adding that the latter "might not be what people anticipated it would be". However, the Soulcage is not mentioned anywhere in-game in Shadowlands. Its purpose was instead revealed in the novel Sylvanas, released near the end of Shadowlands.

Based on its abilities, its pale blue glow, and Helya's connection to the Jailer, the Soulcage was likely an instrument of Domination magic.

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