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'''Headhunters''', or ''Effrit''{{Fn|1a}} were specialized [[Alpha Legion]] infantry during the [[Great Crusade]] and [[Horus Heresy]].

Seeking a further refinement of the [[Seeker Space Marine|Seeker]] concept, the Alpha Legion formed Kill Teams of skilled infiltrators who specialized in creating conditions of all-consuming chaos among the enemy's ranks. They sowed confusion by eliminating key officers, striking key positions, and sabotaging key assets. Had their activities been known by the [[Galaxy]] at large, they would have been greatly feared.{{Fn|1}}