A Tesseract Vault is a vast, monolithic, and near-indestructible Necron construct built specifically to contain a Transcendent C'tan, a mighty C'tan Shard of near-omnipotent power that was once one of the Necrons' deadliest foes.
These Transcendent C'tan, nothing less than the amalgamation of dozens or even hundreds of lesser C'tan Shards, are of such size and indomitable will that they are too powerful to be contained within the extradimensional intricacies of a Tesseract Labyrinth, and a Tesseract Vault serves as both a prison and a conduit for their power instead.
Bound within the vault's heart, the star vampire will fight against its bonds; and such is the elemental might of the C'tan that the walls of the Tesseract Vault are perpetually being destroyed by the insane energies the Star God generates.
It is only the unceasing ministrations of the ever-vigilant Canoptek Leech guardian constructs arrayed and docked around the exterior hull of the Tesseract Vault and an army of Canoptek Scarabs that keep the C'tan in check; these, and the robotic construct known as a Canoptek Sentinel that encloses the C'tan itself in a force shield generated using a portion of the C'tan's own power.
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