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.
