Frenzied troops gain +1 A and Immunity (Psychology).
Berserk Rage
A unit that includes one or more Frenzied models can only choose Hold or Stand & Shoot as a charge reaction.
If, during the Charge sub-phase, a unit that includes one or more Frenzied models could declare a charge, then it must do so unless a LD test is passed. If the LD test is failed, the Frenzied unit must declare a charge against the nearest viable enemy.
A unit that includes one or more Frenzied models that attempts to restrain pursuit if it beats a foe in close combat suffer a LD modifier equal to the result they won the combat against that unit by.
Losing Frenzy
Frenzy can be lost. Models retain their Frenzy for the entire game unless beaten in combat.