Empress Cygnus?

Hmm, I haven't been recently, so I don't recall, but I'm pretty sure that's the effect for her Bomb skill, where you explode after a while, and take massive damage, while also getting stunned. I'm only positive that you can avoid it with more status resistance. I'm not sure what the range for that skill is, but it could also be possible that you can just stay out of range.