So currently, im experimenting on the clan boss team(cant do much experimenting due to keys) 

So in nightmare, I can two key with :

team 1: arbiter, scyl of the drakes, iron brago, stag knight, frozen banshee

team 2: arbiter, scyl of the drakes, iron brago, frozen banshee, rhazin scarhide

Im thinking of who should I replace currently, and I plan to experiment later to replace scyl if that would be ideal. my current idea would be sepulcher sentinel since she can give attack down, defense up and block debuff. but I would loose some healing and a revive(plus my scyl can deal decent damage)

 

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