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Ion Cannon
From Warhammer 40k - Lexicanum

An Ion Cannon for mounting on a Hammerhead
The Ion Cannon is a powerful Tau weapon mounted on large vehicles and starships.
The Ion Cannon itself operates by generating a stream of high-energy ionised particles and launching them at a target using an electromagnetic field. These particles react explosively with the target, transferring tremendous energy at the atomic level.[1][2] The resulting vaporisation only magnifies the amount of damage dealt, with starship-based models comparable to Imperial Lances.[3]
Heavy Ion Cannon Batteries are mounted on Tau Navy ships.[4]
Images

Heavy Ion Cannon mounted on a starship[4]
See Also
Sources
- 1: Codex: Tau, Pg. 19
- 2: Codex: Tau Empire, Pg. 30
- 3: Battlefleet Gothic Armada, Pg. 98
- 4: Battlefleet Gothic Armada 2