Poxwaker

When this creature dies put a -1/-1 counter on
target creature
Sickness, disease, plague and pox, suffering and the
slow, living rot. Such wondrous gifts does Nurgle seek
to bestow upon the unworthy human cattle of the
Imperium. We are merely the vectors by which his virulent beneficence may be spread to the undeserving
masses.
—Urgloth Rotheart, Champion of the Death Guard