If, at the start of the Fight sub-phase, two units from this Formation are locked in combat with the same enemy unit, they gain the Hatred special rule until the end of the phase. If three or more units from this Formation are locked in combat with the same enemy unit at the start of the Fight sub-phase, they also gain the Preferred Enemy special rule until the end of the phase.
Before choosing a unit from this Formation to make a Soulburst action, you can declare that the whole Formation is United in Death. If you do so, the Soulburst action you choose applies to all units from the Formation. You may only use this ability once per turn, and only if no unit from this Formation has made a Soulburst action this turn.
This rule is often presented as Hatred (X) where X identifies a specific type of foe. If the special rule does not specify a type of foe, then the unit has Hatred against everyone. This can refer to a Faction, or a specific unit. For example, Hatred (Orks) means any model with the Ork Faction, whilst Hatred (Big Meks) means only Big Meks. A model striking a hated foe in close combat re-rolls all failed To Hit rolls during the first round of each close combat.
This rule is often presented as Preferred Enemy (X) where X identifies a specific type of foe. If the special rule does not specify a type of foe, then everyone is a Preferred Enemy of the unit. A unit that contains at least one model with this special rule re-rolls failed To Hit and To Wound rolls of 1 if attacking its Preferred Enemy. This applies both to shooting and close combat attacks.