If Ghazghkull is your Warlord, he gains a 2+ Invul save on any turn he calls a Waaagh! This invulnerable save lasts until the start of his next turn. In addition, Ghazghkull and all other models in his unit that are equipped with mega armour can Run on a turn he calls a Waaagh! despite having the Slow and Purposeful special rule (which is conferred by wearing mega armour).
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