Ulfjarl

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 cannot choose to restrain pursuit if it beats a foe in close combat. It will either pursue (if the enemy has fled) or overrun (if the enemy was wiped out in combat). Note that if the enemy is wiped out in combat but the Frenzied unit did not charge that turn (or if the combat was the result of a pursuit or overrun charge in the same turn), then the Frenzied unit will reform as normal as it has no other choice of action.

Losing Frenzy
Frenzy can be lost. Models retain their Frenzy for the entire game unless beaten in combat.

A model with Regeneration gains a Ward Save (indicated by the number in the brackets). This is cumulative with other sources of Regeneration. Regeneration may not be used against Flaming Attacks, successful Killing Blows (including Heroic Killing Blow) or wounds caused due the unit being Unstable.

Hidden models can choose to deploy "hidden" within another friendly ranked unit, either the unit it belongs to (determined in each army list) or in other separate units (the army book in question will state which units) – make a note of which unit is concealing the hidden model(s).

A hidden model is not placed on the table during deployment, but is revealed later during the game. If the concealing unit is wiped out or flees from the battlefield before the hidden model is revealed, the hidden model counts as a casualty. There is no other way a hidden model can be harmed before they are revealed.
Hidden models may be revealed at the beginning of any of your Movement phases, or at the start of any Close Combat phase. Declare that the unit contains a hidden model and place the model in the front rank of that unit, displacing models as you normally would if a character had joined the unit.
A model with this special rule cannot be your army General. Furthermore, other units can never use their Leadership value.

When charging, units entirely made of models with Swiftstride and M 7 or higher roll 3D6, discard the lowest result, and add the result to their M value. When fleeing or pursuing, they roll 3D6, rather than 2D6.

When charging, units entirely made of models with Swiftstride and M 6 or lower roll 2D6, and add the result to their M value. Whenfleeing or pursuing, they roll 3D6, and discard the lowest result.

Swiftstride has no effect on models using a M value lower than 4.

Swiftstride M6 or lower
Charging: M + 2D6
Failed Charge: 2D6
Fleeing/Pursuing: 3D6 (discard the lowest)

Swiftstride M7 or more
Charging: M + 3D6 (discard the lowest)
Failed Charge: 3D6 (discard the lowest)
Fleeing/Pursuing: 3D6

A unit containing one or more Fear-causing model gains +1 to their Combat Resolution bonus. If the Unit Strength of all Fear-causing models is double or more, the Combat Resolution bonus is increased to +2. Note that the bonus from Fear is otherwise not cumulative for having multiple units with the Fear special rule involved in the same combat.

If the majority of the models in a unit cause Fear, they also gain Immunity (Fear), and thus the Combat Resolution bonus is ignored for that unit.

A unit where the majority of the models have this rule can declare to use Counter-Charge as a charge reaction (including Frenzied units) if they are charged to the front by an enemy that is more than its M value away from the Norse unit.

Before the enemy roll their charge distance, the Norse unit must take a LD test. If failed, treat the charge reaction as a Hold. If passed, the Norse unit moves 2D3" forwards using Random Movement, but stopping within 1" of any enemy unit. They may also use any Quick to Fire weapons they might have before they move.

The enemy unit then rolls their charge distance and complete the charge as normal. If the charge is successful, then both units will count as charging in the ensuing combat phase.