

Teleport to each bounty waypoint in Act 2 to snapshot nearby monsters.Grab Templar's weapon, salvage his Shield and Scoundrel's bow.Look for a Zoltun Kulle or Maghda bounty.Craft 1 of each level 70 item from the Blacksmith for every slot, starting with a Two-Handed weapon, Helm and Boots.(If not playing Necro) Create your main class now and log into a T6 Adventure Mode game.

Upgrade the gems in 1x Flawless Diamond, then unlock Anointed in the Altar.Complete these until you have 2x Diamond. At level 18, reduce game difficulty to normal and restart the game until you have Zoltun Kulle/Maghda bounties.If you find the cube before level 18, go to Temple of the Firstborn to reach it.

Very often there's also a Cursed Chest that can help you with that.
