Hey guys Chainer here from twitch.tv/chainerfails
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This is a build for solo greater rift progression with mid 70 capability. It requires heavy fishing for density and open map tiles like silver spire, arreat crater, act 2 sand map, ect. with good progression/small hit box mobs that are stackable. A "Snapshot" is used in this build where you buff your attack speed as high as possible with wrath of the berserker and pain enhancer by grouping density. Once you got a big pack of mobs grouped tightly together pop your potion in the middle of them and your attack speed will stick to your stricken gem and obsidian ring. The attack speed lowers the cooldown on these procs which will allow you to kill bosses faster and keep full uptime on your skills like ignore pain and wrath of the berserker. Using your potion, deaths, or entering a new rift level will reset your snapshot and you will have to re-apply it. To maximize cooldown uptime make sure not to recast ignore pain and warcry until the buff is about to wear off to maximize the amount of zodiac procs go into wrath of the berserker. Try to stay on top of elites/blues when inside density as you will get elite damage that will also spread to whites through area damage when its easy to do. Only kill elites if you have white mob density to kill them in. If the elites get low and you run out of mob density try dragging them to the next room but don't spend too much time doing this for orbs as big white mob density is the best progression. Pain enhancer will get you over 10 dust devils per second in good density rifts. Make sure you get a big snapshot before you spawn the boss as this is where the sticken cooldown can make a couple mins difference. Do not die or pop your potion on the boss as it will hurt your dps badly. Bosses can be really random as some of the best (Saxtriss and Hamelin) can take 3 mins and some of the worst bosses (Tethrys, Rime) can take twice as long. You have to fight bosses differnetly depending on how much time you have. If you have 7 mins left in your rift play it safe and kite away from bad damage if you have 4-5 mins with a bad boss you may have to risk it and fight more aggressively but remember 1 death or potion pop can end your boss fight depending on time as you won't only loose stricken procs but uptime on ignore pain and wrath of the berserker.