Power level guide.
Power level your diablo alts with the help of a friend in under 2 hours.
You can still be powerleveled quite easily, if you have a good friend who is high level / geared.
Friend kills malth for you (unlocks adventure) this step i think is actually optional
Friend makes a level 1 character
Friend creates level 1 game at torment 6
You join game with your level 1 character
Friend makes you party boss and leaves game
Friend joins game on his level 70 and starts killing mobs on same map as you (do bounties til you have a rift key, then do rift).
You are now being powereleveled.
If your friend is competent at 70-t6 you will hit lv70 in a half hour or less.
Credits for Power level guide.