SkillsThere are many skills that you would like to have, but you don't have enough to max them all.
- Berserk - Your main skill, max it.
- Weapon mastery - Max it for a damage and AR bonus.
- Battle orders - Max this for maximum life.
- Howl - A synergy for berserk, put as many points in here as you can.
- Shout - A synergy for berserk, gives a defense bonus so consider maxing this before howl.
- Whirlwind - Always worth a point.
- Leap - At least 1 point, maybe a few more depending on preference.
- Other handy skills - Natural resistance, increased speed, iron skin, all worth 1 point as their level will increase with +skills.
- Battle cry - Lowers enemy and damage, can be useful against high-defense characters.
- War cry - stuns opponents.
Example buildHere is a nice, easy example build:
Enigma (any, I use duskshroud), grief PB (any IAS is OK, but 37+ is desirable so you can negate 10% slow), stormshield "eld" (or "jah" for life, or "ber" for DR%), gore rider (upped, if you like), drac's (more str is better), thundergod's (any), 20 dex ravenfrost, angelic ring + amulet, arreat's face (socket with 40%ED/15IAS for more damage and to easily reach the IAS BP), widow maker on switch (I find it more useful generally than having a little extra life from bo weapons), 4*5fhr SCs, torch, anni, and the rest whatever life SCs you have (I prefer life/res).
You shouldn't have to put any points in strength, stat for max block, the rest in vitality.
With the above setup you have maximum zerk and whirlwind speed, 48% FHR, decent damage, max block, high DR% (or max if you chose "ber" in the shield).

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http://imageshack.us/photo/my-images/196/skillscb.jpg/Duelling StrategyGeneral tipsLeft/right clickI keep berserk on left click and all other skills on right click, skills you may need to keep at easy reach are:
- Teleport - Probably the most used skill.
- Whirlwind
- Throw/unsummon - used for locking.
- leap.
TelezerkGet used to doing this, it is your bread and butter. Teleport on your opponent and straight away holding left click to zerk while aiming at your feet, this will land a swift blow on the opponent and ties together with chainlocking.
Chain-lockingThe art of maintaining a namelock on your opponent while teleporting and attacking. When you click your opponent to attack attack and they move away (walking or teleporting) keep the zerk button pressed, select teleport on right-click, right-click to teleport and immediately zerk at your feet, hopefully (and with skill and practice) your will straight away regain your left-click name lock, This process can be repeated over and again.
LeapStun your opponent briefly by performing a short leap.
Defensive opponentsUse widow maker against these, make them bring the fight to you.
Mêlée duelsSince berserk sets your defense to zero a mêlée duel will end quickly and not in your favour, so as an alternative you can use the concentrate skill as it is a pre-requisite. It has lower damage and AR than your main skill but it's not too bad.
Hit-and-runSometimes you want to perform a single tele-zerk and then run way, this is used against opponents who aren't expecting it and/or those with high defense.
Widow makerGet some practice using this bow, it is very useful. Its main purpose is to trigger open wounds, causing your opponent to want to attack you. Get good and firing and running, firing and running.
Battle cry / war cryUse these to stun and lower the defense of enemies, battle cry is especially useful against opponents that are hard to hit.
Specific OpponentsSorceress (any element) Difficulty: Easy
When it comes to fighting a sorceress there are only 2 variables: ES and MB, and the only 1 of these that really matter is MB as it can make dueling them a little bit harder.
You may wish to alter your equipment to increase your FCR breakpoint, you should certainly try to have some open wounds as this tends to hurt sorcs a lot and is especially useful because a sorceress will generally play defensively against you. If circumstances allow it then consider wearing either an abs item or an increased res item, or if it is a BM duel just put both on. Due to their low defense this opponent lends itself well to chainlocking, so get plenty of practice in. You will be able to tank most sorcs easily, those that you can't (either they have huge damage or they have max block) be prepared to use whirlwind, this will prevent you from getting hit quite to much and will allow open wounds to trigger a bit more readily.
Sorceress mêlée Difficulty: Easy
Zerk (or concentrate, see above) them until they die.
Amazon - bow Difficulty: Easy
Since you have max-block and high DR% this is a very easy duel, and the quickest way to dispatch them is to use whirlwind, not very exciting for a zerker but there you go, although zerking them is very easy also due to them having low life.
Amazon - java (and hybrids) Difficulty: Medium
The trouble with these is the dodge skills, hitting them can take forever, but when you do they will be dead. Probably you will want to put thundergod's on for this duel. If you find yourself having trouble then do some super-short whirlwinds as this will help keep them stun-locked. Hybrid amazons fall into this category because of the javelin component to that build, if you catch them using their bow against you then treat them as a bowazon.
Paladin - smite Difficulty: Very hard
Unfortunately berserk is of very little use against an opponent that always hits, your best best is to either hit-and-run (see above) or play as a whirlwind barb, at least you have max DR%.
Paladin - hammer Difficulty: Tricky
Sometimes you get a hammerdin that is really easy, or is played very badly, these are no problem, it's the others that are a bugger. If they are jodering or otherwise playing defensively then use widow-maker, this works like a charm against a charging paladin and is also useful for getting rid of their oak (which causes difficulty for zerking). If they teleport onto you then you need to be in their blindspot, the exact location of this depends upon the range of weapon you are using, it is generally underneath them and slightly to the left. Once in the blind spot you can zerk away at them, but be prepared for them to realise they aren't hitting you and teleport on you again, often it is best to try 3 or so zerks and then teleport to a safe spot.
Paladin - FoH Difficulty: Easy
You have enough stacked res available to nerf most of their damage, you can either just run after them or use tele-zerks. If they manage to keep out of your range well enough then get out the widow maker.
Druid - Tornado Difficulty: Easy-medium
Most druids have low blocking and low defense, in which case it is really easy to zerk them down, though in this duel you will benefit a lot from having a high FHR breakpoint as the tornadoes can stun you at just the wrong moment. You might like to whirlwind their wolves/bear (this is where that life leech comes in handy, it can recharge you surprisingly quickly) in order to get a clean shot at them. Often a druid will have low-ish FHR as well, so use your leap to your advantage. If you anticipate them teleporting onto you then use war cry to stun them a little, this can make a huge difference, especially if you end up tri-whirling them. If they play defensively then use widow maker with drac's, maybe you will get lucky and trigger open wounds, though at the very least you have a chance to hit them.
Druid - Fire claws / fissure Difficulty: Easy
Fire claws druids are a joke, though a good one may require hotspurs. Tele-zerk a fissure druid.
Druid - Fury / fire claws Difficulty: Easy-medium
Fury druids can take you by surprise sometimes, though ones that good are rare. Make sure you use concentrate and not berserk, and then basically go toe-to-toe. Don't forget you can whirlwind them if they give you trouble.
Druid - Rabies Difficulty: Medium-hard
Unless you have a huge amount of poison res it can be very hard to kill them once they have poisoned you as their general strategy is to just walk away at that point making them tough to hit (especially if they are max block, and they will be). Try to do as much damage as you can before you take the rabies as this is the only time they will be offensive, make them chase you as you whirlwind for example. Once you are poisoned try to telezerk them, though be careful as they may switch to fury.
Necro - Poison Difficulty: Easy
You might need to stack some poison res, but generally a simple tele-zerk is all that is needed.
Necro - Bone Difficulty: Easy-hard
The main problem with these necros is that the clay golem will slow you down, if you have any stacked IAS equipment then now is the time to wear it. Avoid spirit trains, watch out for invisible projectiles and play offensively.
Assassin- Trap Difficulty: Easy-medium
Thankfully you will have enough life and resistances to be able to tank all her traps, so one strategy is to just hold the zerk namelock, when she teleports away then you can perform a nicely timed tele-zerk. Sometimes trappers will play very defensively, jumping around all over the place, use your leap to give you a chance to attain the namelock. If all else fails play as a whirlwind barb.
Assassin- Whirlwind Difficulty: Easy
Just stand and use concentrate, if she back off for a second then tele-conc, feel free to use whirlwind yourself, even with 1 point your will beat her.
Assassin - Hybrid Difficulty: Easy-medium
The whirlwind part doesn't really affect you, so treat them as trappers.
Barbarian - Whirlwind Difficulty: medium-hard
Even with 1 point in whirlwind you should have an advantage over BvCs due to your max block, so it entirely possible to play like a smiter (using concentrate of course, see "Mêlée duels" above), if in doubt you can whirlwind too. If they try to whirlwind away then shoot some arrows at them. The trouble starts if you meet a BvA or a BvB because whirlwind has a fundamental advantage over concentrate, certainly you will struggle to conc them, let alone zerk them.
Barbarian - Zerk Difficulty: easy-hard
Well, this could go either way if you both just go toe-to-toe, though statistically things like defense, AR and damage will have a part to play in this duel so if the other zerker is built as more of a pure mêlée character then you will be at a big dis-advantage, but if he is general-purpose as well then who knows who will win. You can use concentrate to avoid dropping your defense to zero. You can also allow him to attack first in order for his defense to drop to zero before you strike.
VideosI made some fun videos recently of PvP zerk barb play, if you're interested in play-style for this build then take a look, there are a few nifty tricks displayed.
http://www.youtube.com/watch?v=p19TAPDte-whttp://www.youtube.com/watch?v=Um1VpWeCL4oReferences and Further ReadingBerserk description at battle.net -
http://classic.battle.net/diablo2exp/skills/barbarian-combatskills.shtml#berserkUnique barbarian helms -
http://classic.battle.net/diablo2exp/items/normal/ubarbarian.shtmlTitanseal's attack speed calculator -
http://diablo3.***/tips/calcs/speedcalc_titanseal/speedcalc_english.php