This is a great basic chaos/sword tank build from Thom which can be easily altered to meet the various situations you’ll find in the first 3 Nightmare Dungeons.
Actives
Blade Torrent
Steel Palace
Karma
Martial Discipline
Stunning Swirl
Trial by Swords
Chaotic Pull
Diamond Grit
Passives
Agitator
Unfair Advantage
Regeneration
Perfect Storm
Hardcase
Breakdown
Forged in Fire
No Love Lost