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Cube of Chaos
From Warhammer 40k - Lexicanum
The Cube of Chaos was a device being built by the followers of Chaos. If it was activated, it would create a hole in the fabric of space and allow the realm of Chaos to enter through the warp. When it was nearing completion, a squad of Space Marines invaded the ship the Cube was being built on and destroyed both it and its creators.
Source
- 1: Space Crusade (video game) Mission 12, Game manual pg. 25