Mehlendri Silversoul was an Aeldari Farseer of Craftworld Iyanden who was instrumental in the development of the Infinity Circuit. She first mastered the technology at some point in the 33rd Millennium of the Imperial Calendar.
She was one of the first of the Aeldari to recover Waystones from the Crone Worlds that were all that remained of the ancient Aeldari Empire and use her allied Bonesingers to adapt them to both contain Aeldari souls and integrate them into an Infinity Circuit.
At the end, Silversoul realised that a soul had to be used to fully awaken the new psychic matrix and she offered up her own, willingly embracing death to offer a new hope of limited immortality to her people. Legend says that she lingers closer to the living world than other souls, and is always the first to welcome Iyanden's newly deceased into the Infinity Circuit's embrace.
- Iyanden: A Codex: Eldar Supplement (6th Edition) (Digital Edition), "Iyanden's Rise and Fall"