It blocks off attempts at reading his mind and sending telepathic thoughts to him, which is as much a liability as it is a boon since the only way he could communicate with his Cute Mute love interest was through her Psychic Powers.
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Tohma's Black Knight form in Magical Record Lyrical Nanoha Force gives him this in addition to other abilities.Instead of the victims of his Geass trying to block him out, he tries to block out everyone else. Inverted in Code Geass by mind-reader Mao.Touma is also mostly immune to telepathy due to Imagine Breaker, though one exceptionally powerful psychic was barely able to get a thought into his head (which would have instantly been erased if he had so much as touched his head with his hand). In A Certain Magical Index, an unexpected side effect of Misaka's electricity powers is immunity to psychics, as her natural electromagnetic fields interfere with their mental signals.A variant of the latter will simply No-Sell the mind reading attempt no matter how hard the psychic tries to get at the person's mind, they get no feedback, and no success-the mind will likely read as a "blank". The latter is (usually) a much more active defense from being taken over, it will give enemies a Poke in the Third Eye if they put their brains where they don't belong, and may even turn the tables and let the defender sneak into the invader's mind.
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The former is a passive defense used to protect sensitive secrets from enemies, and may even be doubly defended if the owner isn't aware he has them in the first place.
#DARK HERESY MIND LOCK FULL#
It comes in two flavors: specific memory blocks and full mind defense. To continue the computer metaphor, this is to do with it being a "hardwired" defense rather than one that is executed after startup. It's a step up because it's always on, and slapping, distracting or KO'ing the defender won't shut down the defense. The Psychic Block Defense is a step up from Psychic Static, it stops an enemy using a Mind Probe, Telepathy, and various forms of Mind Control from getting at the owner's juicy brainmeats by putting up the mental equivalent of a Blue Screen of Death.