It depends on the mob/strength of that particular bind land. Higher level NMs typically break when any damage is done, i.e. if I bind Zipacna even a 1 damage Dia will break it, however I've routinely stuck it on Groundskeepers who stayed bound through 1k+ damage. I think part of that is more level-difference adjusted than anything else but I don't really have testing to back that up.
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