Daemons of Nurgle have the Hatred (Daemons of Tzeentch) special rule. Enemy units in base contact with a Daemon of Nurgle suffer a -1 penalty to their Weapon Skill.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Daemons of Nurgle have the Hatred (Daemons of Tzeentch) special rule. Enemy units in base contact with a Daemon of Nurgle suffer a -1 penalty to their Weapon Skill.