When it comes to the best Barbarian build in Diablo II: Resurrected, it's hard not to suggest players to go for the Whirlwind route.
One of the strongest configurations in the game, let alone the class, the Whirlwind Barbarian build turns players into an unrelenting spinning wheel of death, that especially carries in Nightmare and Hell difficulties starting around Lvl. 40. Here is how to assemble the best Barbarian build in Diablo II: Resurrected.
Best Barbarian Build in Diablo II: Resurrected
Starting off with the stats for this Barbarian build, you'll want to put enough Strength and Dexterity to use the equipment you want (e.g. the indestructible Phase Blades require 136 Dexterity points). After that, simply spend all your remaining points in Vitality as it will often be the deciding factor in whether or not you survive a fight on the harder difficulties — even more so than armor or other resistances. It's generally a waste for Barbarians to put points into Energy as you can always refill your mana using potions.
For the skills, on the Warcries, you'll want to put one point into Howl, then max out Shout and Battle Orders. and then put one point into Battle Command. For Combat Skills, put one point into Ash, Leap, Stun, Leap Attack, Concentrate and Berserk, and then completely max out the star of the show, Whirlwind. Lastly, with the Combat Masteries skill tree, put 20 points into Sword Mastery, and one point into Increased Stamina, Increased Speed and Natural Resistance before putting the remaining points into Iron Skin.
For the gear, there are a lot of good options, but mainly prioritize those with Crushing Blow, Deadly Strike, Mana Leech, Life Leech, % Damage Reduction, % Enhanced Damage and Max Damage/Life/AR Charms.
Lastly, for the mercenary, go for the Act 2 Nightmare Might Mercenary as the Might Aura will greatly increase your damage.
Overall, the Whirlwind Barbarian is arguably the best melee class in the game thanks to its superb AOE, Crushing Blow/Deadly Strike hits and ability to duel wield weapons.