Datari comes from a long line of assassins. She spent most of her life in the Astral Sea, working with her parter, Arzoa. They were banished when they attempted - and failed - to murder the High Priest of The Raven Queen.
Datari and Arzoa knocked out Laz Ursulus and brought him to the Eighth Son after Eighth Son saw Laz's likeness on a piece of wall from the Temple of the One. When Laz was sent to follow the Sandstriders, Datari and Arzoa checked in on him, using Datari's Astral Mark to track him wherever he went.
While the Sandstriders were gone in the Faewild, Datari and Arzoa assassinated The Mixer, pinning the blame on Elendeil. They continued to monitor Laz until he had his demonmark removed by an expert in Gurno.
The duo returned to Eighth Son and were there when he held his economic conference. The Sandstriders defeated them in battle and dismantled Eighth Son's operations. Datari, Arzoa, and Eighth Son are all currently sitting in prison cells in Stin Cepel.