Immunity
The model ignores the effects of the rule(s) named in brackets (e.g. Killing Blow, Poisoned Attacks, Flaming Attacks) -- physical damage from the attack still applies unless it's also listed as non-physical. Immunity (Psychology) covers Panic, Fear and Terror together and auto-passes Psychology tests, though the model may still never choose Flee! as a charge reaction except via Feigned Flight/Fire & Flee (or if it also has Frenzy).