In Diablo II, what item is used to combine Horadric Cube recipes?

The Horadric Cube is the item used for combining recipes in Diablo II.

Players obtain the Horadric Cube during Act II by completing the Halls of the Dead quest and finding it in the Halls of the Dead level 3. The cube provides extra inventory space and transforms selected combinations of items into new results.

Its recipes can create or upgrade equipment, combine gems, and support important quest objectives. The cube is also required to assemble the Horadric Staff, a key item used to enter Tal Rasha’s chamber. The Horadric Cube is sometimes confused with the Horadric Staff because both are central to Act II, but the cube is the reusable transmutation device, while the staff is a specific quest item.