Soul Ash

Soul Ash is found in Torghast, by defeating the wing bosses found on the final floor of a run.

Currency for
Soul Ash is used to craft and upgrade legendaries with the Runecarver. Higher base-level items require more soul ash, and players can spend the difference in costs to upgrade. For instance, to move from an item level 210 item to an item level 225 item, they will need to spend 1200 Soul Ash.

Trivia

 * During early testing, this currency was named Carcerus.