For warriors gripped by a fighting frenzy, all rational thought is consumed by a hunger for violence.
Source: Warhammer: The Old World Online Rules Index
FrenzyURL Copied!
A Frenzied model has a +1 modifier to its Attacks characteristic. This modifier does not apply to the model's mount (in the case of a cavalry model), to the beasts that draw it (in the case of a chariot), or to its rider (in the case of a monster).
In addition:
If the majority of the models in a unit are Frenzied, the unit automatically passes any Fear, Panic or Terror tests it is required to make.
If a unit that includes one or more Frenzied models is able to declare a charge during the Declare Charges & Charge Reactions sub-phase of its turn, it must do so.
If the majority of the models in a unit are Frenzied, it cannot choose to Flee as a charge reaction, nor can it ever choose to make a Restraint test.
Losing Frenzy
Unlike other special rules, Frenzy can be lost during a game. Any model that loses a round of combat will immediately lose this special rule.