Instinctive Behaviour - Feed 1-3 - Cannibalistic Hunger: The unit immediately suffers a number of hits equal to
the number of models in that unit. These hits are resolved using the unit's majority
Strength (if drawn, use the highest) and AP-. Wounds are allocated by the owning player
and armour saves (but not cover saves) may be taken. After resolving casualties (if any)
the unit can do nothing else until the end of its turn. Units consisting of only a single
model treat this result as Devour (below), instead.
4-5 - Devour: In the Shooting phase, the unit cannot shoot or Run. In the Assault phase,
if the unit is able to declare a charge, it must do so against the closest viable enemy unit.
If the unit cannot declare a charge, it does nothing in the Assault phase.
6 - Kill: This follows all the rules for Devour (above). In addition, the unit gains the Rage
special rule.
Smash All of the close combat attacks, except Hammer of Wrath attacks, of a model with this special rule are resolved at AP2 (unless it's attacking with an AP1 weapon). Additionally, when it makes its close combat attacks, it can choose instead to make a single Smash Attack. If it does so, roll To Hit as normal, but resolve the Attack at double the model's Strength (to a maximum of 10). Furthermore, a model making a Smash Attack can re-roll its armour penetration rolls, but must abide by the second result.
