Now that I have mentioned Wrath of the Berzerker, a common question I see on the message boards is how to maintain it indefinently. First thing's first: you need the Thrive on Chaos rune in order to do this, next, you need enough critical hit chance, IAS, and movement speed (more move speed = more tornado's produced from sprint) to be able to generate fury necessary to keep the buff. Also, the monsters must have enough health on whatever MP level you are on to support being hit enough to generate that fury. Beyond that, it is all dependent on tactics.
Wrath of the Berzerker is by far the best singular buff in the game, it gives you amazing offensive and defensive buffs along with crowd control immunity....who wouldn't want this buff 100% of the time? Keeping it maintained indefinently comes down to 2 things, generating enough fury, and spending excess fury.
Fury generated while at maximum of your globe does not increase the uptime of Wrath of the Berzerker, this is a VERY IMPORTANT thing to understand, and it is the cause of most people losing the buff. Fury generation is rarely the issue, but it is the gentle balance of spending the fury necessary so that all fury gained is applied to keeping the buff. In order to spend fury the Whirlwind has 2 consistently used skills that are able to accomplish such a task, Battle Rage and Sprint. These skills must be used when they can be in order to drop fury to a level where fury gained is applied toward keeping Wrath of the Berzerker.
I generate enough fury where during WW battle except on single target I can spam Battle Rage every time it is available, when I have a single target or so many enemies that I can't spend enough fury I like to double or triple tap the Sprint skill. A lot of people make their mistake on this....if you just continue to hit sprint constantly you will not produce tornados until the last use of the skill, it resets the tornados produced every time you click the skill, by double or triple tapping the skill, allowing 2-3 seconds for your tornados to produce, then repeating that you can effectively drop your fury and refill it without bottoming out your fury. Here is a video of me using such a tactic:
As you can see, the timer on my Wrath of the Berzerker does not count down hardly at all even on single targets, plus I am actually able to add time to the buff when I find a pack large enough to support the fury generation necessary.
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