More thinking aloud...
Assuming Nurgle's Rot stays the same as 0.4.3 (formation level, does a single extra BM/hit), how do people feel about this as a new Character upgrade?
Biologus Putrifier CH - - - -
Blight Grenade Rack (15cm) (Small Arms) EA+1 (maybe also Ignore Cover)
Invulnerable Save
Disease Factory: if this formation has Nurgle's Rot, add one to the number of Nurgle's Rot 'hits' inflicted by this formation when working out assault results.
(Editing note, just a rough text, it would need to be redone with less ambiguity.)Cost 25-35pt, available to Plague Marine Retinues, Chosen and Terminators.
Background-wise they refine and distil plagues and diseases for use on the battlefield, and enhance the effects of other troopers' Blight Grenades. And they explode in noxious vapours when killed.
