Скачать или смотреть Diablo 4 Den Mother, Barbarian first playthrough (veteran diff)

Very important, kill adds asap, otherwise they stun you.

Try this build:

Basic Skill: Lightning Strike - Enhanced Lunging Strike (will heal you when you damage adds)

Core Skill is either of this:
Whirlwind - Enhanced Whirlwind
or
Rend - Violent Rend

Pressure Point (core passive skill)

Defensive Skill:
Rallying Cry - Strategic Rallying Cry
Iron Skin

If you're still struggling, try to find a good yellow weapon which will bust your damage, level up to get more defensive/offensive skills and try to find legendary items.

In this video I was level 13 and used a legendary item that gave me barrier every 30 seconds, it was a bit helpful.
But first time I killed the boss at level 9 without defensive skills at all (only 2 skills: Lunging Strike and Rend) and no legendary, this was much more challenging, forgot to record it.