Crane's are one of my favourite classes, they're Tri-beam packs a punch, their bleed is not to be messed with, and they can disable an opponent (sleep and that move where they freeze you in place).

But that's against one person, Kanden's right though, the Crane's sister class, Turtle, is the most efficant one for what your seeking. And when Giant Kamehameha is released with lv 60 patch, you can multiple hit targets in the confusion zone. It would be a good PvE play for a rook.

Cranes and turtles are build the same way as Karma and Plasmas, while plasma is more aoe centered , karmas are centered around debuffs, But that doesnt mean you cant use a karma on pve or crane. This game pve content is just too easy and simple, you basically just need 2 key classes , healer and ultimate majin. The other classes can be picked at random.