Hey all, never built a caster so I have literally no idea where to start beyond using the titular Harbinger set and taking Occy for Doom Bolt. Any pointers or a rough GT sketch would be nice and greatly appreciated! I couldn’t find a relevant up to date build using Harbinger set. Thanks in advance!
My first thought would be to go Deceiver or Pyromancer for the RR. I personally don,t like using thermite mines, so Deceiver seems like a better choice IMO.
If you can find a second skill to use between DB cooldown, that also happened to clear crowds, it could make a good combo.
There are conduits that convert WoP, Canister bomb and Stun Jacks to Chaos. 2 Medals also converts BWC and Grenado.
Since you also get 240% Weapon damage to doom bolt, you can kinda treat it as an attack, stacking flat damage and benefiting from ADCTH
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Here is my harbinger + rah’zin doom bolt build… has insane damage output from the bolt alone. When u attack training dummy, its 1/5 health is gone instantly.
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This is VERY hastily thrown together, It probably has a ton of flaws, but it’s a good place to start tinkering IMO
Used @fishy’s suggestion and added Oblivion as the in-between attack. Debuff with SBoE, Solael’s flame, and WoP, then Nuke with Doom bolt and fill the gaps with Oblivion. Cast speed is a bit low however, but with better gear choices it can be solved.
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I go with Pyro, since you can still go with Chaos BWC
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Here is another Deceiver, with a bit higher casting speed. If you want to use Oblivion effectively, you’ll want cs. Harbinger set makes it hard to get above 170 with reasonable cc and defense. 
(even with max-roll cs on the gear).
Chaos Harbinger DB/Oblivion Deceiver
I left the green and conduit suffix blank, in the case you are self-found. Also, spirit is cranked, but you don’t really need it that min-max.
Likely for an optimal Oblivion/DB build, a different 2H/gloves with cs would be preferable to get up to 200% cs. It’s not like Harbinger really needs a filler…you shoot stuff.
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