Icefire Warhead
From Warhammer 40k - Lexicanum
An Icefire Warhead is a specialized missile weapon employed by the Tau Empire. Launched from orbit, the Icefire emits electromagnetic pulses which disable or destroy any technological devices within the target area. While usable against the equipment and vehicles of most of its foes, the Icefire has no effect on the Necrons.[1]
Source
- 1: Apocalypse Reload, pg. 68