Nurgle's Gift (Aura)
(Rule)Description: If your Army Faction is DEATH GUARD, while an enemy unit is within Contagion Range of this unit, subtract 1 from the Toughness characteristic of models in that enemy unit. Contagion Range changes over the course of the battle, as shown below.
CONTAGION RANGE
1st Battle Round: Contagion Range = 3"
2nd Battle Round: Contagion Range = 6"
3rd Battle Round Onwards: Contagion Range = 9"