Build:
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Unless you're turbo geared, I recommend that you go for a single target build and just focus on trying to burn down Raest instead of trying to cleave adds down with an AoE build.
Gear used: Basic The War Within greens from questing with some blue gear from Follower (normal) dungeons. I bought the chest piece and shoulders from The War Within renown vendors, both are at upgrade level 1.
Trinkets: Ara-Kara Sacbrood (Normal difficulty) and Abyssal Trap (but you can use anything you want, I just used what I could get).
Weapon: I just used whatever weapon I had from The War Within, in this ca...