another 2man challange that you should try if u want some fun with good geared chars. Palace of yun rau HM with Sin + Dt.
DT with a shady but effective healthtap specc without any generalpoints.
Boss burned down to 89% to trigger hardmode -> healer brought to boss for nuke -> SIN using lotus overload + dull pain + avatar + the dmg reduction from lethargy. Dt using hexmarked + bloodpact.