The town Alchemist handles rune transmutation. Combining 9 runes of matching rarity produces a single rune in return: either a random rune from the next rarity tier up, or, on a failed roll, a random replacement of the original rarity. Legendary and set runes cannot be transmuted until Inferno difficulty is unlocked. Since a failed attempt refunds one rune, each failure costs an effective 8 runes while a successful upgrade consumes 9, which the reference table factors into its average costs.

This cube interface mirrors the genuine in-game system and features identical probabilities. Choose a target rarity to load the slots and hit Transmute; the tool logs your total attempts and successful upgrades as you play.