Exotic berserker's back piece
There is the Guild Assassin Backpack you can buy with 5 guild commendations + 5 gold
Also there is the Prototype Fractal Capacitor that cost 1350 fractal relics
(and the other 8 elite specs maxed too)
temple of grenth
Ferguson’s Crossing [MAIN]
temple of grenth
Wrong stats- that’s PVT.
Ember Solace [SOL] – A guild welcoming of newbies and those at the margins.
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As far as I know there isn’t an exotic berserker backpiece. I got one, because I had a magic find back before the magic find change and was able to turn it into a berserker piece. But there is no vendor/recipe for one sadly.
I think the Balthazar temple offers one with crit on it. But it really comes down to what stat you are wanting to prioritize in place of berserker stats.
But now that you can make ascended backpieces with Bloodstone Dust in the Mystic Forge, you can look into saving up for an ascended berserker back (warning: powerful blood is insanely expensive >.<). Can also still make it/buy from Fractals stuff as well.
Guild assassins back piece from NPC named Tyrian Explorer Olread
http://wiki.guildwars2.com/wiki/Guild_Assassin_Backpack (scroll all the way down)
From the guild vendor in LA. cost 5g+5 guild commendations.
https://www.youtube.com/watch?v=6q3em9s5I4c