Bitter Duty A unit that includes any models with this special rule may not be joined by any model that does not also have this special rule (this includes Legion Techmarines and Legion Apothecaries, which may not be assigned to a unit with this special rule unless they also have this special rule).
Hatred (X) This rule is 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 (Mechanicum) means any model of the Mechanicum Faction, whilst Hatred (Thallax) means only Thallax. A model striking a Hated foe in close combat re-rolls all failed To Hit rolls during the first round of each close combat.
The effects of this special rule only apply when a unit that has it begins an Assault phase not locked in combat and then either Charges or is Charged by an enemy unit. If an enemy unit Charges this unit when it is already locked in combat then that does count as a new ‘first’ turn of combat for the effects of Hatred.
