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Every Daemon has a true name that is used to bind it to one of the Chaos Gods. Repeating a Daemon's True Name to it binds it to the speaker. The confusion of a new master significantly disorients and weakens the Daemon, allowing it to be destroyed or banished more easily, as demonstrated by Justicar Alaric and Imperial forces when banishing Ghargatuloth on Volcanis Ultor^[1].

For Daemons who were once mortals, such as Chaos Space Marines who have ascended to Daemon Prince status, their mortal names sometimes function as their True Names. During the Invasion of Ultramar, Uriel Ventris weakened the Daemon Prince M'kar by identifying him aloud as Maloq Kartho, formerly a Dark Apostle of the Word Bearers^[2].

Sources

• 1: Grey Knights (Novel) - The Grey Knights Omnibus by Ben Counter: Chapter Twenty, pgs. 273-274
• 2: The Chapter's Due (Novel) by Graham McNeill: Chapter Twenty-Four, pg. 470