An Icarus Stormcannon Array is the primary ballistic anti-aircraft weapon system employed by the Space Marine Stalker. The Stalker mounts an array of two Icarus Stormcannons granted a capacity for independent targeting by the servo-mind conclave (Cogitator array) to which they are shackled.
Each servo-mind can direct the Stormcannons to track separate targets with a lesser degree of accuracy, or when faced by more potent foes the array can concentrate fire in a single, withering salvo that will tear even the mightiest winged beast or enemy aircraft from the skies.
- Codex: Space Marines (6th Edition), pg. 121