Pretty much all of what Columbo said. Most things a staff can do, other sets can do better. That said, I really like using the staff and have alot of fun with it.
I’m currently running http://intothemists.com/calc/?build=-k;4R0kT0w4Z0-Z0;9;5T44T;145A;4347;9;5k51s with mostly Berserker gear. However I’m thinking of moving points from earth and possibly air into water to get cleansing wave and healing ripple. Some of the spell/trait choices could be further optimized, as I have a couple of safety nets to compensate for me being bad at dodge rolling, and generally making bad decisions/mistakes. For example the elite skill should probably be the flaming greatsword, however I have the elemental equipped so I can summon it just before I’m downed to increase my chances of rallying.
The biggest “problem” I have with staff is, that you have to work really hard to get any kind of damage output. Once again as Columbo mentioned, the only blast finisher you have is earth 2, and the wind up from that is longer than duration of most of the fields, so you may want to find a friend with a lot of blast finishers, and tell them to spam it inside your fire 2.
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