A slipspace flake was a central component of a Forerunner slipspace drive. They were quantum-engineered crystalline devices, and were used aboard Forerunner spacecraft to modulate the ship's passage through the higher dimensions, being a major contributor to their markedly stable slipspace transitions. All slipspace flakes were chipped from a central "core" crystal, the location of which was known only to the Master Builder.
The crystal found by Dr. Halsey in the ruins beneath CASTLE Base on Reach may have been a slipspace flake, though it possessed time/space-bending properties beyond simply enabling faster slipspace travel.
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