Stardust Herb is an Materials in Divinity: Original Sin 2
"A gift to Rivellon from one of the elemental monarchs of the Realm of Faery. Talented craftsmen call it the shock that brings life to runes..."
Stardust Herb is intended to be ground into Stardust using the Mortar and Pestle to ultimately make pixie dust. It's relatively rare, so you'll need to keep an eye out for it if you will be crafting a lot of Pixie Dust. While the tooltip says it grants immunity to a wide variety of status effects, this doesn't appear to work. The game will not allow you to consume it even though you can select consume and watch your character go through the eating animation.
Where to find:
- Sold by Merchants
- Found randomly around the game world
Note and Trivia about Stardust Herb