Horadric Cube
From Median-XL
Far from being the interesting magical gimmick you may be used to, the Median XL cube is a powerful weapon of war.
Unlike in the vanilla game, the Horadric Cube is available right from the start of the game. It only takes 2x2 slots in the inventory while containing 15x10 slots worth of items. Note that charms and relics do not work while they are inside the cube.
For cube recipes, please view the doc page.