The rod of office each Locus carries is no simple staff, but a complex neurological transmitter called a Neurotraumal Rod crafted for them alone by their gene-sect's Magus and Clamavus. It sends out destabilising frequencies designed to upset synapses and thought waves.
Should the Magus' unnatural charisma not prove sufficient to achieve the cult's goals, the Locus will subtly turn the ornate handle atop their Neurotraumal Rod so as to increase the field of mental disruption that emanates from the artefact, inducing harrowing visions, splitting migraines or terrifying brain-spasms in the minds of nearby non-cultists.
Those canny enough to realise the source of their sudden anguish may reach for their pistol, only to be cut down in what the Locus and their master can confidently claim to all concerned was an act of pure self-defence.
- Codex: Genestealer Cults (8th Edition), pp. 47, 90