I know that while pulling for aoe groups, I usually run song of travel, and every now and then I'll get hit by a chromo dispel or a melee. I'm assuming the highest level of drac / wurm / drake has a % chance to see invis. The invis breaks are almost certainly not caused by social aggro since I run way ahead of the train. I might swing by SF sometime to test this for sure, though.
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[60 Bard] Pescador (Half Elf) <Rustle>
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