These books are used to summon evil creatures, using one in certain places may have interesting effects. They enable you to create and bless items, see below. These reagents are orange crucifixes that drop in late Terror and in Destruction difficulty. Note that not all Mystic Orbs can be bought.
These reagents can be obtained by buying them from any magic items vendor or by killing monsters. This reagent is created by cubing Arcane Shards in sets of five. This reagent is obtained by disenchanting unique items, see below. These reagents can be bought from the appropriate vendor. Oils/Catalysts/Sacrifical Heart/Meditation Candle Crafting Point requirements are listed near the recipe in grey text: Many cube recipes work only if you have the required amount of Crafting Points on your equipped items.
Median XL overhauls its function from a cute gimmick to an important tool of war. The Horadric Cube is an underused aspect of Diablo II.