Runes are small objects that, like gems and jewels, have no function until they are socketed into an item. See a [[Runes Scarcity|full runes listing]]. Runes can be upgraded; 2 or 3 of one type, plus a particular gem type/quality, can be combined in the [[Horadric Cube]] to upgrade to the next higher level rune. Runes add different properties to shields or armor vs. weapons, and sometimes shields and armor differ as well. Runes are most powerful when combined into special [[Runewords]], so be sure you check the recipes for those. [[Runes Scarcity|Full runes listing]].
=Rune Scarcity=