You have to have a Great Unclean One, and then at least 6 more 'Daemon of Nurgle' units. That includes Epidemius and the Herald of Nurgle, as well as Plague Drones, Plaguebearers, Nurglings and Beasts of Nurgle.
It costs a 100pts.
You can find it in the Grand Alliance: Chaos book.
It works like this:
In each of your hero phases, each model from the Tallyband of Nurgle that is within 21" of their Great Unclean One heals d3 wounds. You can instead return d3 slain models to each unit of Plaguebearers from this battallion if they are within 21" of thei Great Unclean One in the hero phase.
Increase the number of wounds that can be healed/slain models that can be returned to d6 if this battallion has 14 or more units at the start of the hero phase.
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