I have get a lot of feedbacks that pengmeng is hard, so I asked our designer to give some tips for you.
Boss has a first attack skill, but the speed of him is low.
We may need a Holy shaman to get a speed above 1000, auto silence, then use holy water to purge a stramina- elemental shaman.
The elemental shaman needs to be faster than holy shaman, auto mana tide totem, active lighting storm.
That's some tips. I hope this may help.