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From Warhammer 40k - Lexicanum
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The '''Prism Cannon''' is an [[Eldar]] weapon of great destructive potential. It uses a medium strength laser beam and passes it through a finely tuned crystal prism which both greatly amplifies the power of the laser and spreads it over a large area. This makes the weapon use a two stage firing mechanism, although with the advanced Eldar technology this is not a problem.