I am a big fan of Whirlwind Barbarians and after reaching level 25 and testing out as many legendary powers, I think I came up with a build to make whirlwind viable.
Skill Points: Includes 2 points from Renown System (26 points total)
3x Flay - Enhanced Flay - Battle Flay (makes enemies Vulnerable)
5x Whirlwind Rank 3 - Enhanced Whirlwind - Furious Whirlwind (applies Bleed)
3x Pressure Point Passive (30% chance to make enemies Vulnerable)
3x Rallying Cry - Enhanced Rallying Cry (unstoppable) - Tactical Rallying Cry (gain Fury)
2x War Cry - Enhanced War Cry (berserking)
4x Death Blow Rank 2 - Enhanced Death Blow - Strategic Death Blow (gain Fury)
1x Pit Fighter Passive (increased damage to close enemies)
1x Hamstring Passive (bleeds slow enemies)
1x Cut to the Bone Passive (bleeds deal increased damage to Vulnerable enemies)
3x Call of the Ancients - Prime and Supreme upgrades for Fury Generation
Legendary Powers:
Damage Powers:
Whirlwind pulls enemies toward you
Whirlwind has a chance to summon an Ancient
Whirlwind creates Dust Devils
Whirlwind has increased crit
Bleeding has a chance to Stun enemies
Increased Damage to Crowd Controlled Enemies
Bleeds have a chance to do % of its damage as direct damage
Increased Damage when Barrier is Active
Resource Powers:
Dodging gives you Fury
Using Shouts reduces cooldown for each nearby enemy (Using both shouts near big mobs greatly reduces the CD allowing for more fury generation and longer damage buff duration)
Defensive Power:
Gain Barrier when you hit an elite (fairly certain bosses count as elites)
There was another power that I am forgetting but these are the main ones. It was a sub optimal build. I am sure I could have tweeked it to be better than what it was. That said, I was almost instantly melting mob packs and Boss fights were fairly easy with Barrier and Call of the Ancients. It falls behind the Rend Thorns Barb slightly as far as Single Target boss fights but in every other instance it wrecks.
Cons: It is extremely dependant on Legendary Powers. Too much imho. If you don’t find all the damage powers listed, the build feels pretty flat. There should be some wiggle room for utility or resource generation in the legendary power department but there isn’t really. The build is also resource starved. While you using Whirlwind in large packs, you have a lot of Fury with popping both shouts. You can also use Call of the Ancients after your Fury drops low for Elite and Boss fights to get more Fury. Problem is half of the time during boss fights, you will have to switch to Flay and using Death Blow when Flay makes the Boss Vulnerable. Another issue is when getting gear upgrades and having to extract the Aspect power to put on the new piece of gear. That process can get quite expensive.
Overall it is a good start to a Whirlwind Bleed build. I just wish the build wasn’t so dependant on the Legendary Powers. If the Enhanced Whirlwind trait could give a little more fury per hit, that would be nice too.
EDIT: I would like to add that using The Butcher’s Cleaver unique 1H Axe would probably be the best for this build and would be the final power you would want to aim for. Unfortunately it never dropped in the early access open beta when I killed The Butcher. I believe it only drops in Nightmare and Torment.
The reason I say this is because when you critically strike, you immobilize your target. This works in conjunction with the 2 powers (increased damage to CC enemies, whirlwind has increased crit) for the build.