An Ion Shield is a potent defensive energy field generator carried by the combat walkers of the Questor Imperialis, the Imperial Knights, and by the Renegade Knights of the Questor Traitoris. These devices use ancient technology to project an energy field across a narrow arc, and by moving the position of the shield so that it intercepts enemy attacks a Knight is able to survive even the heaviest of fire while still being able to return fire from its own weapons.
The settings and positioning of the Ion Shield is essential, as the shield is only designed to deflect and slow shots rather than absorb them in the manner of the more powerful Void Shields used by Titans and Imperial starships. There exist rarer patterns of the standard Ion Shield that provide a greater area of protection, at the expense of efficiency and greater cost in power.
- Codex: Imperial Knights (7th Edition), pp. 117-118
- Warhammer 40,000: Index - Chaos (8th Edition), pg. 109
- Warhammer 40,000: Freeblade (Video Game)
- Warhammer 40,000: Dawn of War III (Video Game)