Chariot of Slaanesh

Some warriors and creatures in the Warhammer world are almost completely fearless, or such grizzled veterans that scenes which would make lesser troops panic have no effect on them.
Troops that are immune to psychology are never affected by fear terror, frenzy or any other Psychology rules. Troops immune to Psychology may never flee as a charge reaction - they are far too proud and brave to do this! These troops still have to take Break tests as normal.