Dubious Command

(Rule)
Description: At the start of each of the controlling player's Assault phases, the Herald of Nurgle from a Rotswarm can attempt to direct a single unit from his Formation that is within 12" of him. To do so, he must take a Leadership test. If the test is passed, the directed unit can re-roll failed charge rolls and all models in the unit can make 3 additional Attacks until the end of the turn; if the test is failed, the directed unit must attempt to charge the nearest enemy units in this Charge sub-phase, but is otherwise unaffected.