The residual material of liberating a Constellation into The Eternal Symphony by liberating their tether to Arcanoria. This is a core resource for Constellation Syncretism, and enhancing current Constellations. Its primary use is to have the Civilization release their Legends to the peace of the afterlife in The Eternal Symphony, after releasing them, they can't be accessed anymore.
The amount of Stardust left by a Constellation on Syncretism and liberation scales proportionally with the amount of Resonance they had which is measured by both Constellation Renown, their Myth Grade, and their Constellation Worship.