The Daan were a group coexisting with the Melida on Melida/Daan within the Cadavine sector. After the Melida captured the Daan's leader, a diplomatic mission was initiated by the Jedi Order and Republic senator Lexxir Greylark, accompanied by his eighteen year old son, Axel Greylark, to negotiate the leader's freedom. However, during the extraction of the leader, an explosion occurred, revealing the mission to be a setup intended to demonstrate the consequences of aiding the Daan to all of their allies. As the Melida approached and the trap was sprung, the senator was trapped by falling debris from an explosion, and a Jedi Knight rescued an injured Greylark, compelling him to abandon his father to die. In 382 BBY, Greylark recounted the event to the Jedi Gella Nattai.
Within the current Star Wars canon, the Daan's initial mention was in Zoraida Córdova's 2022 novel, The High Republic: Convergence. The Daan were originally created in the Star Wars Legends continuity, making their debut in Jude Watson's young adult novel Jedi Apprentice: The Defenders of the Dead from 1999.