I love this spec tbqh - I've even made a similar version using Cindercoat and Fire damage. It's so crazy because stacking all the fire dmg and resource reduction through things like Cinder let's me basically NEVER run out of Wrath and hit just as hard as Shot. And the piercing effect from the Flame Shield Bash rune is awesome. (Plus a sweet boost from Akarat's Fire Starter) - And you can also leave room for things like Auhgilds (did i spell that right? lol) to the mix with RorG so you can get plus dmg vs elites and a lot of toughness to survive standing in hazards. I just need to get my gear a bit better and get lucky on a Piro that rolls %chance to block plus other stats - just out of mats atm XD.
yup if you get the right gear you can even do better than a holy shotgun =D
This build is different and probably t6 viable, but there's no way the damage can compete with sg sader. You forget sg hf hits 3x at melee range. In the below solo video, I'm hitting 50m unbuffed vs trash and upwards of close to 90m vs elites (260m+) without Harrington. This doesn't even factor in 20% critical chance buff from judgement.
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http://m.youtube.com/watch?v=mpwIYB0w8sE