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There are several different Production Runes. They are used in, you guessed it, the production of finished goods via Crafting.
Each has a Worth of 1 . They have a chance to drop from all mobs in the game. You can also use Disenchanting (Ggl) to Dismantle a piece of equipment, which yields one random Production Rune.
Whenever a mobs loot table says "Production Rune", it can randomly be any of the following runes: