Vorn is a krogan botanist living in Elaaden. He is kidnapped by outlaws when they steal the colony of New Tuchanka's seed vault, but can be rescued if Pathfinder Ryder chooses to help Nakmor Drack retrieve the vault.
During the recovery, Vorn tells Drack he intends to court his granddaughter Nakmor Kesh, much to Drack's irritation. If spoken to at his stall, Vorn can ask Ryder to give Kesh a flower. Vorn can later be seen visiting the Nexus, consulting at Hydroponics.
If Ryder chooses to rescue Drack's scouts from the Archon's flagship, he will inform Kesh has laid several viable eggs. When spoken to at his stall, Vorn will reluctantly admit to being the father.