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Vortex Meter:[/COLOR] (From the FAQ) It is long term vortex bonus, each sacrifice will add up in the vortex meter and give you bonus rewards when full.

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is the vortex meter the purple bar?
I was just sacrificing some 2*toons in 4x-groups when suddenly a purple "bling" came and a popup that gave me massive amount (3 legendary souls, 2 G/A Souls and some skill shards.

Nice bonus!