I cannot see any brute secondary beyond fire when paired with staff will be fast enough to be considered a 'farmer'
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If you want a quick Farming build
Go with a scrapper, you get your Crits in there.
Suggested Powers:
Spines
and
Fire Aura
Yes the Notorious Fire Aura.
You get two active PBAoE's
its nice.
Quills+Blazing Aura=WinWin
you get more AoEs with dark/fire brute...just saying though 
If they release a pitchfork skin for Staff Fighting you can have a LITERAL farming toon!
Anyway, I don't have enough time on SF to say how good they are, but anything can farm so long as it can survive it.
Just wanted to ask has anyone considered if Staff will be good for farming? I was thinking of Staff/Elec or Staff/WP on a brute. Normally I would do this on a scrapper however there is no build up that would give the scrapper the edge, only a minor buff from the forms. Just wondering if fury would make up the difference. Mainly going to be doing maps with mobs that are easy kills for influence.
Bump and Grind Bane/SoA
Kenja No Ishi Earth/Empathy Controller
Legendary Sannin Ninja/Pain Mastermind
Entoxicated Ninja/PSN Mastermind
Ninja Ryukenden Kat/WP Scrapper
Hellish Thoughts Fire/PSI Dominator
Thank You Devs for Merits!!!!