The 'Solo Boss Build' is recommended, with this build you can kill squishies easily and solo any boss at level 10. Do not get seen when you enter the boss area or someone might sneak up on you right as you're about to finish the boss.
Seismic Slam is your main source of damage, save Whirlwind for healing against multiple targets instead of wasting fury for pitiful damage.

If you use the auto-attack build, you need to weave in your attacks between Seismic Slam for maximum effect.