I've actually had a really difficult time trying to clear it. I've done it about 20 times. Just had a perfect run, hit with all three dragonkillers, duty finder team had good communication, and we still lost! Think Vishap had like 10-20% HP left. Also used the limit break. Really not sure what we did wrong. It's frustrating because it is the last thing holding me from the expansion and I can't seem to get past it. I hope they tone it down or something.