EARLY GAME:
Go full strength and use a 2-handed sword, no shield for most of normal and nightmare with wolf stance for the movement speed and attack speed, wolf/lion stance with stormblast for boss killing, bear for tough areas. You can max wolf stance for rushing to hell with insane movement speed and respec later. Make 75% resistances and a high defense body armor a priority and you'll have no issues. Use whatever runewords you want along the way but don't count on them at 90+ as you'll be using runemaster and want to maximize the number of runes in your gear. Also, you will likely have mana issues on boss fights but mana on attack mos on your weapon will let you spam your abilities freely. Try to get
The Dao of Xiansai
and some of the tiered uniques listed in the midgame section that you find/you can create.
The Dao of Xiansai
Great Sword (4)
One-Hand Damage: (8 - 9) to (25 - 37)
Two-Hand Damage: (15 - 17) to (31 - 43)
Required Level: 11
Required Strength: 105
Item Level: 17
Strength Damage Bonus: (0.16 per Strength)%
+1 to All Skills
15% Attack Speed
15% Hit Recovery
+(15 to 25) to Maximum Damage
(51 to 75)% Bonus to Attack Rating
+(18 to 35)% Enhanced Damage
+(101 to 150) Defense
+1% to Experience Gained
Socketed (2)
One-Hand Damage: (24 - 27) to (61 - 73)
Two-Hand Damage: (45 - 50) to (79 - 94)
Required Level: 29
Required Strength: 151
Item Level: 33
Strength Damage Bonus: (0.16 per Strength)%
+2 to All Skills
25% Attack Speed
25% Hit Recovery
+(31 to 40) to Maximum Damage
(101 to 125)% Bonus to Attack Rating
+(52 to 69)% Enhanced Damage
+(201 to 250) Defense
+2% to Experience Gained
Socketed (4)
One-Hand Damage: (59 - 64) to (123 - 149)
Two-Hand Damage: (114 - 123) to (172 - 201)
Required Level: 49
Required Strength: 291
Item Level: 54
Strength Damage Bonus: (0.16 per Strength)%
+3 to All Skills
35% Attack Speed
35% Hit Recovery
+(51 to 70) to Maximum Damage
(151 to 175)% Bonus to Attack Rating
+(87 to 103)% Enhanced Damage
+(301 to 350) Defense
+2% to Experience Gained
Socketed (5)
One-Hand Damage: (77 - 83) to (166 - 193)
Two-Hand Damage: (148 - 160) to (228 - 259)
Required Level: 57
Required Strength: 570
Item Level: 90
Strength Damage Bonus: (0.16 per Strength)%
+4 to All Skills
40% Attack Speed
40% Hit Recovery
+(71 to 90) to Maximum Damage
(176 to 200)% Bonus to Attack Rating
+(104 to 120)% Enhanced Damage
+(351 to 400) Defense
+3% to Experience Gained
Socketed (6)
Great Sword (4)
One-Hand Damage: (8 - 9) to (25 - 37)
Two-Hand Damage: (15 - 17) to (31 - 43)
Required Level: 11
Required Strength: 105
Item Level: 17
Strength Damage Bonus: (0.16 per Strength)%
+1 to All Skills
15% Attack Speed
15% Hit Recovery
+(15 to 25) to Maximum Damage
(51 to 75)% Bonus to Attack Rating
+(18 to 35)% Enhanced Damage
+(101 to 150) Defense
+1% to Experience Gained
Socketed (2)
One-Hand Damage: (24 - 27) to (61 - 73)
Two-Hand Damage: (45 - 50) to (79 - 94)
Required Level: 29
Required Strength: 151
Item Level: 33
Strength Damage Bonus: (0.16 per Strength)%
+2 to All Skills
25% Attack Speed
25% Hit Recovery
+(31 to 40) to Maximum Damage
(101 to 125)% Bonus to Attack Rating
+(52 to 69)% Enhanced Damage
+(201 to 250) Defense
+2% to Experience Gained
Socketed (4)
One-Hand Damage: (59 - 64) to (123 - 149)
Two-Hand Damage: (114 - 123) to (172 - 201)
Required Level: 49
Required Strength: 291
Item Level: 54
Strength Damage Bonus: (0.16 per Strength)%
+3 to All Skills
35% Attack Speed
35% Hit Recovery
+(51 to 70) to Maximum Damage
(151 to 175)% Bonus to Attack Rating
+(87 to 103)% Enhanced Damage
+(301 to 350) Defense
+2% to Experience Gained
Socketed (5)
One-Hand Damage: (77 - 83) to (166 - 193)
Two-Hand Damage: (148 - 160) to (228 - 259)
Required Level: 57
Required Strength: 570
Item Level: 90
Strength Damage Bonus: (0.16 per Strength)%
+4 to All Skills
40% Attack Speed
40% Hit Recovery
+(71 to 90) to Maximum Damage
(176 to 200)% Bonus to Attack Rating
+(104 to 120)% Enhanced Damage
+(351 to 400) Defense
+3% to Experience Gained
Socketed (6)
MID GAME:
Build:
► Show Spoiler
Since you want to use runes in every socket you'll rely on tiered uniques and crafts to start. Here's a list of equipment that you can use to farm your charms solo (use https://docs.median-xl.com/doc/items/tiereduniques to see the proper sigma stats).
► Show Spoiler
Nothing in this list is hard to come by. We use a shield for the base defense it provides (you have a lot of %total character defense so the base defense on body armor and shield become very important) and the shield bonus to lion stance more than makes up for not using a 2h sword. Use 15% enhanced defense mos on body armor and shield until 200% enhanced defense and then put full jah runes in them and in your weapon. For the other items use whichever runes you find useful at the time, I used some resists, 5% strength or 3% all attributes. Our gear focuses on high %attack rating (900%+) to make up for going full strength (with the dex you get from charms, gear and mountain king together with the combined %ar on gear you will have 80-90% chance to hit) and runemaster, immortal together with wolves helps us achieve insane def and some avoid (20-30%) in lion stance to counter the -%dr. Some more %lifesteal or life after kill from your crafts is needed but if you don't have it you can use pots from time to time instead.
PLAYSTYLE:
Summon your wolves, buff with Thundergod
Lion Stance + Iron Spiral will stunlock mobs and kill them fast
Lion Stance + Stormblast will melt bosses and other high hp targets
Wolf Stance + Windform to get to a place/skip mobs
Bear stance is needed sometimes, if your hp is dropping you can quickly switch mid-combat, heal up, switch back to doing dmg or kill slower in bear stance if that's what you're comfortable with. For just a few areas you'll need permanent bear stance for the %dr (your chance to be hit is likely 5% in lion stance as well).
CHARMS:
Aeriel's 2h barb guide has a fantastic section on progression through ubers that I followed and you can rely on his knowledge, for some you'll need to stay in bear stance but for others you'll find that killing them faster in lion stance makes the fight that much easier.
Stats of my fresh barb in Lion stance:
http://prntscr.com/mdqheq
http://prntscr.com/mdqum4
http://prntscr.com/mdqvfq
Just try the build out, especially Lion Stance + Stormblast on bosses with 1400% + enhanced weapon dmg is lots of fun, I can assure you that there are very few builds that melt them quicker with tiered uniques and you can farm k3k and tran athula easily. I just wanted to share with you something that works and has an endgame variant (max block) that you can transition into. If any high level gladiator's dominance barbs want to share their side of the story I will add an endgame section with their name

PS: If any active, well-regarded forum member can start a miniguide thread for sigma that would be very nice, I was reluctant to post this as I haven't reached the very endgame (125+) but it is legitimately a very high damage build with decent survivability that just breezed through nightmare and hell and was able to get his charms with no special gear.
EDIT: Apologies for the lack of activity, real life got in the way, this mini-guide was intended as a "get me to 120 smoothly" build, I'm happy other (better) players took the early-mid game variant and made endgame builds

theidleone wrote:I followed this build until I hit about 120 and then made my own changes.
I'm currently lvl 138 and can comfortably solo Duncraig, Fauztiville, and Bremmtown in 8-player games.
Very viable and very fun.
I have 1.2 Million def in Bear Stance and 600k in Wolf Stance.
I hit 11k max on Iron Spiral and have 19k life.
My recommendations:
Wolf Stance instead of Lion Stance
Put 10 points into Bear Stance for the phys res
Put 15 into Wolf Companion so you can have a few around to tank for you and in case one gets lost
Don't focus on lightning spell dmg or lowering enemy res
Defense, FHR, Attack Speed, Life on Attack, and Life After Each Kill are what allow you to slice right through crowded areas
My gear:
Weapon:Qarak's Will(Jah runes)Qarak's Will
Giant Sword (Sacred)
One-Hand Damage: (150 - 163) to (233 - 246)
Two-Hand Damage: (206 - 225) to (285 - 305)
Required Level: 100
Required Strength: 480
Item Level: 105
Strength Damage Bonus: (0.16 per Strength)%
15% Chance to cast level 34 Spike Nova on Melee Attack
6% Chance to cast level 40 Pentagram on Melee Attack
10% Chance to cast level 36 Bloodlust on Kill
+(30 to 60)% Bonus Damage to Bloodlust
Adds 50-125 Damage
Adds 84-167 Fire Damage
+(26 to 38)% to Fire Spell Damage
+(140 to 170)% Enhanced Damage
+(100 to 250) Life after each Kill
5% Reanimate as: Random Monster
Socketed (4)
Shield:The Ancients' Legacy(2x -14% req jewels and 2x Jah runes)The Ancients' Legacy
Gilded Shield (Sacred)
Defense: (15050 - 16085) to (17457 - 18740)
Chance to Block: 3%
(Barbarian Only)
Required Level: 100
Required Strength: 2450
Item Level: 120
+4 to Barbarian Skill Levels
2% Base Block Chance
40% Block Speed
Enhanced Weapon Damage +90%
+(172 to 200)% Enhanced Defense
+5000 Defense
30% Bonus to Defense
Requirements +250%
Socketed (4)
Helm:Metalhead(Lah runes)Metalhead
Great Helm (Sacred)
Defense: 2420 to 3551
Required Level: 100
Required Strength: 1250
Item Level: 105
3% Chance to cast level 10 Stormblast on Melee Attack
3% Chance to cast level 10 Shower of Rocks on Melee Attack
Ignore Target's Defense
Adds 1-50 Lightning Damage
+(1000 to 2000) Defense
+2 Life on Striking
25% Bonus to Defense
3% Reanimate as: Random Monster
-5 to Light Radius
Requirements +100%
Socketed (4)
Armor:Strength Beyond Strength(Lah runes)Strength Beyond Strength
Gothic Plate (Sacred)
Defense: (8339 - 9198) to (10115 - 11157)
Required Level: 100
Required Strength: 675
Item Level: 120
1% Chance to cast level 36 Pyroblast on Striking
Adds 25-38 Damage
150% Bonus to Attack Rating
+90% Damage to Demons
25% Life stolen per Hit
10% Deadly Strike
+(172 to 200)% Enhanced Defense
1% Reanimate as: Random Monster
-5 to Light Radius
Socketed (6)
Amulet:Klaatu Barada NiktoKlaatu Barada Nikto
Amulet
Required Level: 110
Item Level: 105
30% Enhanced Damage vs. Necrobots
10% Chance to cast level 40 Nova Bomb on Melee Attack
+2 to All Skills
25% Attack Speed
Adds 1-188 Lightning Damage
+650 Poison Damage over 2 seconds
Stun Attack
+(11 to 16) to Hive
Lightning Resist +(40 to 50)%
Poison Resist +(40 to 50)%
Belt:Black Void(Lah runes)Black Void
Heavy Belt (Sacred)
Defense: (3060 - 3442) to (3304 - 3717)
Required Level: 100
Required Strength: 625
Item Level: 120
20% Attack Speed
Adds 10-15 Damage
(10 to 15)% Life stolen per Hit
Slow Target 10%
+(140 to 170)% Enhanced Defense
10% to Strength
10% to Dexterity
Target Takes Additional Damage of (25 to 50)
30% Magic Find
Socketed (2)
Ring 1:Giant's KnuckleGiant's Knuckle
Ring
Required Level: 100
Item Level: 120
20% Attack Speed
Adds 10-15 Damage
(5 to 10)% Life stolen per Hit
5% Deadly Strike
+25 Life Regenerated per Second
Physical Resist 5%
Ring 2:Adrenaline RushAdrenaline Rush
Ring
Required Level: 100
Item Level: 120
+1 to All Skills
40% Combat Speeds
40% Movement Speed
Maximum Elemental Resists +1%
Gloves: Abandoned Craft Sacred Gauntlets w/ all stats and res (Lah runes)
Boots:Wind RunnerWind Runner
Boots
'SilElqSilGul'
Runeword Level: 100
+(0 to 1) to All Skills
50% Attack Speed
10% Movement Speed
Adds 25-68 Damage
250% Bonus to Attack Rating
(12 to 15)% Life stolen per Hit
+(171 to 200)% Enhanced Defense
On switch: A CotW crafted barb axe and a great sword, both full of Nih runes.
Cheap Alternatives for the expensive pieces:
Armor:Marchosias' MightMarchosias' Might
Full Plate Mail (Sacred)
Defense: (8595 - 9436) to (10308 - 11338)
Required Level: 90
Required Strength: 1400
Item Level: 1
5% Chance to cast level 3 Bladestorm on Melee Attack
+50 to Maximum Damage
+(144 to 171)% Enhanced Defense
+1000 Defense
+(151 to 200) to Strength
(6 to 10)% to Strength
Requirements +100%
Socketed (6)
Marchosias' Essence
(Druid Werewolf Set)
Belt:Marchosias' Hatred(for the 40% strength set bonus) orMarchosias' Hatred
Heavy Belt (Sacred)
Defense: (3111 - 3455) to (3359 - 3731)
Required Level: 90
Required Strength: 625
Item Level: 1
5% Chance to cast level 3 Bladestorm on Melee Attack
3% Chance of Crushing Blow
Enhanced Weapon Damage +(55 to 60)%
+(144 to 171)% Enhanced Defense
(6 to 10)% to Strength
Socketed (2)
Marchosias' Essence
(Druid Werewolf Set)The Endless LoopThe Endless Loop
Light Belt (Sacred)
Defense: 1101 to 1143
Required Level: 100
Required Strength: 550
Item Level: 105
40% Combat Speeds
+(10 to 19) to Charged Strike
Slow Target 10%
+50 to all Attributes
+50 Life Regenerated per Second
+(0 to 1) Mana on Striking
Socketed (2)
Shield:Kodo
Rings:RipstarRipstar
Ring
Required Level: 60
Item Level: 60
+0.5625 to Maximum Damage (Based on Character Level)
+20 Life on Melee Attack
Boots:Zealot RushZealot Rush
Light Plated Boots (4)
Defense: (67 - 78) to (102 - 119)
Required Level: 6
Required Strength: 31
Item Level: 10
5% Attack Speed
(10 to 40)% Movement Speed
(11 to 25)% Bonus to Attack Rating
+(21 to 40)% Enhanced Defense
(3 to 5)% to Dexterity
1% Reanimate as: Random Monster
Socketed (1)
Defense: (248 - 281) to (338 - 384)
Required Level: 24
Required Strength: 62
Item Level: 27
10% Attack Speed
(10 to 40)% Movement Speed
(41 to 55)% Bonus to Attack Rating
+(41 to 60)% Enhanced Defense
(9 to 11)% to Dexterity
2% Reanimate as: Random Monster
Socketed (2)
Defense: (613 - 685) to (817 - 914)
Required Level: 41
Required Strength: 218
Item Level: 48
20% Attack Speed
(10 to 40)% Movement Speed
(71 to 85)% Bonus to Attack Rating
+(61 to 80)% Enhanced Defense
(15 to 17)% to Dexterity
3% Reanimate as: Random Monster
Socketed (3)
Defense: (944 - 1044) to (1247 - 1378)
Required Level: 50
Required Strength: 436
Item Level: 83
30% Attack Speed
(10 to 40)% Movement Speed
(86 to 100)% Bonus to Attack Rating
+(81 to 100)% Enhanced Defense
(18 to 20)% to Dexterity
4% Reanimate as: Random Monster
Socketed (4)
I'm happy to answer any questions.