Daemons of Nurgle have the Daemon, Hatred (Daemons of Tzeentch), Shrouded, and Slow and Purposeful special rules. In addition, units that are composed entirely of Daemons of Nurgle are treated as having defensive grenades.
A unit that contains at least one model with this special rule counts its cover save as being 2 points better than normal. Note that this means a model with the Shrouded special rule always has a cover save of at least 5+, even if it's in the open. Cover save bonuses from the Shrouded and Stealth special rules are cumulative (to a maximum of a 2+ cover save).
A unit that contains at least one model with this special rule cannot Run, Turbo-boost, move Flat Out, perform Sweeping Advances or fire Overwatch. However, they can shoot with Heavy, Salvo and Ordnance weapons, counting as stationary even if they moved in the previous Movement phase. They are also allowed to charge in the same turn they fire Heavy, Ordnance, Rapid Fire or Salvo weapons.
Models with the Daemon special rule have a 5+ invulnerable save, and also have the Fear special rule.
At the start of each Fight sub-phase, a unit in base contact with one or more enemy models that cause Fear must take a Leadership test (called a Fear test) before any blows are struck. If the test is passed, all is well and there is no effect. If the test is failed, the unit succumbs to fear - all models in the unit have their Weapon Skill reduced to 1 for the remainder of that Fight sub-phase. Note that a model that causes Fear is not itself immune to Fear, and will still need to take a Fear test if it is base contact with any enemy models that cause Fear.
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.
