One Punch Barbarian (Close as you'll get) - Legacy Avalanche Earthquake. Two Versions! Fire first, then Physical.
This is the Barbarian version of the One Punch Monk. Not as effective since Quake and Avalanche are DOT skills but it's the same style.
There are two versions. Bolder Toss Physical and Frenzy Fire.
How it works is you Furious Charge to the next boss and smash them, then repeat.
This is basically Might of the Earth build but a Legacy of Nightmares version with charge instead of leap.
Yes the Wizzard, Monk, and Witch Doctor are better BUT, if you really want a similar barbarian build that does a pretty good job for a T10 speed rifts, this is an option.
Now for the fire build: