5 tips on how to use the Horadric cube in Diablo 4
via polygon.com
Short excerpt below. Read at the original source.
The Horadric cube in Diablo 4 is an endgame crafting system that you can use to improve your gear by adding new affixes and even turn them into a legendary item. To access this system, first you must own the Lord of Hatred DLC and complete the campaign’s third chapter.