At the end of any enemy Charge sub-phase in which one or more of your units has been the target of a successful enemy charge, choose a friendly unengaged unit composed entirely of Beasts of Nurgle that is within 12" of at least one enemy unit that has successfully completed a charge this phase. The Beasts of Nurgle unit must immediately declare and resolve a charge against that enemy unit, even though it's the enemy Charge sub-phase!
Note that this special counter-charge can only be done in the enemy Charge sub-phase. If the Beasts of Nurgle unit is within 12" of two or more enemy units that have successfully completed a charge this turn, you may choose which of these units the Beast of Nurgle attempt to charge (you may not decalre a multiple charge). In either event, next choose another friendly unit entirely composed of Beasts of Nurgle (if there is one) and repeat the process.
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