I usually get thru crusade with a good team like dk, commander, ninja, machinist and chaplain at lvl 95. Usually around 13 or 14 my middles die first and just replace but I always make sure my dk and healer are alive and 9 out of 10 times I get the it all although it rly makes a difference when u time your ultimate so I tend to retreat and jump back in. Feel free to comment with abother good team I like to change it up