Diablo II: Lord of Destruction/Horadric Cube

Additional uses for the Horadric Cube.

Normal items
Throwing weapons cannot be used as input.

Since output normal items are only ILvl 1, items can be created with tiers 1-2 skill bonuses (particularly claws, since those that can have skill bonuses are normally too high in level to have tiers 1-2). This can also be used to restrict the maximum number of sockets the item can receive.

Portals
These portals can only be opened in Harrogath in Act V of Hell on the Realms (they cannot be opened in Single Player, despite the Keys being able to drop).

Normal items
Throwing weapons cannot be used as input.

Although 1-6 sockets are added, the number of sockets is restricted by item type, item level and specific item. For example, body armor can have maximum 4 sockets, ILvl < 26 body armor can have maximum 3 sockets, while any Splint Mail can have maximum 2 sockets: this means any Splint Mail has 1/6 chance of 1 socket and 5/6 chance of 2 sockets (2-6 sockets, restricted to 2).

BUG: Ethereal armor applies the ethereal defense bonus a second time to output: for example, normal Sacred Armor has (487-600) base defense so ethereal Sacred Armor has (730-900), but after socketing it will have (1,095-1,350). This can be (ab)used to create Rune Word armor with extremely high defense: for example, a Prudence body armor's (140-170)% Enhanced Defense would result in (2,628-3,645) defense when made in the socketed ethereal Sacred Armor.

Runes
Ladder and Single Player

Rare items
Base item type is upgraded. An ethereal rare armor or weapon will remain ethereal (including an ethereal Crystal Sword or Dimensional Blade upgraded to Phase Blade), and any sockets or gems, jewels or runes in those sockets will also remain.

Required level increases are cumulative, so a rare item upgraded from Normal to Exceptional, then Exceptional to Elite will have Required Level +12 (5+7).

Although armor with Enhanced Defense normally has base defense set to its maximum value +1 (added before any ethereal bonus), upgraded armor with Enhanced Defense has its base defense value randomly selected again.

BUG: Upgraded ethereal items are set to the maximum Durability of the base Exceptional or Elite item. For example, when ethereal Mesh Armor (Durability [45/2] + 1 = 23) is upgraded to Boneweave, it now has maximum Durability 45.

Unique items
Ladder and Single Player

Base item type is upgraded, so Ginther's Rift Dimensional Blade becomes a Ginther's Rift Phase Blade (not a Lightsabre Phase Blade or an Azurewrath Phase Blade).

An ethereal Unique armor or weapon will remain ethereal (including an ethereal Crystal Sword or Dimensional Blade upgraded to Phase Blade), and any sockets or gems, jewels or runes in those sockets will also remain.

Required level increases are cumulative: a unique item upgraded from Normal to Exceptional, then Exceptional to Elite will have Required Level +12 (5+7).

Although armor with Enhanced Defense normally has base defense set to its maximum value +1 (added before any ethereal bonus), upgraded armor with Enhanced Defense has its base defense value randomly selected again.

BUG: Upgraded ethereal items are set to the maximum Durability of the base Exceptional or Elite item. For example, when ethereal Shaftstop Mesh Armor (Durability [45/2] + 1 = 23) is upgraded to Boneweave, it now has maximum Durability 45.

External link
The Horadric Cube (The Arreat Summit)