How does crafting runes work?

im not sure i understand it, if i want to craft a specific rune it says ''reforge legendary runes of ritual but if i wanna craft 1 lith rune i need 3 lith runes? huh o.O what is this , getting runes for a uber unique needing 6 of them is near impossible and harder to find than actually getting the uber unique it self

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By using 3 of the same you get one random rune. By the title you might understand that you need three of the same rune to get the same one. The game does not tell you that the outcome is a random rune.