Alternatively to invis break, when they get low you charm the ones thats lower (under 20%) and bard slow the higher HP one, and balancing slow with dots on only the high hp one usually ends up with both breaking at like 10% hp, which is easy to finish off since they're now running. This takes a bit of practice to get a feel for when you should slow / dot (and stop doing it at low hp) but its just as effective to get the mobs to break charm at very low HP %.
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