My Build:

Barbnoob

Lunging Strike
Steel Grasp
Iron Skin
War Crybaby
Unchallenging Shout
Rallying Crybaby

No core skill.

currently lvl 80 doing up to lvl 45 dungeon

guessing this weakass build can push max 65-70 NM dungeon when hitting lvl 100.

just try tier 100 i bet you can do it easily

we ain't talking bout your mom here

maybe my english is bad but just so you know my mom is not a nightmare dungeon

I would contact Blizzard support and request char name change to Barnoob. Should go across 86-90 with that setup.
Maybe 91-100 if they buff barn again on 1.1.2.

yes

what!

Thorns build?

currently yes, there is thorns involved, slowly going to be moving away from thorns as it becomes less effective as I level since there is no more thorns to gain.

I only know thorns builds with flay + bleed. I feel like you are missing an additional dmg-source except thorns. But also I didnt play thorns builds yet.