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Cry: Dispel (or, alternatively, shake, kick:D)
Effect: Dispels hostile spells. The higher the hero's level, the greater the chance that high-level spells will be dispelled.
P.S.: This is just a draft, but I think the essence of the idea is clear...
In general, I'm a big fan of Dark Magic, and therefore I think it's necessary to add cries that are specifically aimed at weakening the enemy, and it would be good to have something that affects a large number of units. And also, to complete the set, something similar to Summoning magic, because this aspect of magic is generally ignored by the cries. In the sense that if you compare the cries to the magics:
LIGHT - Collective Cry, Chief's Order, Call to Blood, Battle Cry
DARKNESS - Frightful Roar
CHAOS - Rage of the Horde
SUMMONING - ???????
Added 6 minutes later
Although, judging by the responses of people on the forum, few people use cries often.