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Horadric Cube Gambling for Socket Recipes All of the recipes are mentioned below in order. Once you reach Amn you'll need to start combining a gem along with the three runes in order to upgrade it. For El - Thul you need 3 lower ranked runes of the same type combine them all in the Horadric Cube to get the next rune in line.
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You can use the Horadric Cube to upgrade your lower ranked High Runes into higher ranked ones. High Rune Horadric Cube Recipes - Diablo 2
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