Auto warcry on this item does not interact with Cry of Thunder, producing none of the bonuses (weakening the warcry significantly!) and preventing use of the legacy for 60 ticks due to the long warcry timer. I suspect they also do not mesh with mountaineer avalanche-warcry, and other warcry bonuses.

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I figured given the echo 'You shout your warcry', you'd benefit from... using your warcry? Oh well.