13 Grandfather's gift

Nurgle enjoys little more than watching his followers
spread his diseases upon the mortal races.
Score 1 victory point if at least one enemy
unit was completely destroyed during your
turn, and the last model in the unit was slain
by an attack made by a DEATH GUARD
model attacking with a plague weapon (i.e.
a plaguesword, the Plague Skull of Glothila
or any weapon with the Plague Weapon ability).