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Harpoon Missile
From Warhammer 40k - Lexicanum

Harpoon Missile[2]
The Harpoon Missile is a type of Imperial Titan-class weapon.[1]
This one-shot weapon takes the form of a wire-guided missile whose barbed head becomes lodged in the Titan's body. Electrical surges produced by the missile short out the Titan's systems and controls. Moreover, control of the hit Titan passes from the target to the weapon wielder.[1]
Sources
- 1: White Dwarf 142, pg. 49
- 1: White Dwarf 133 (UK), pg. 52