Delrian, situated as the second planet within its solar system, functioned as a penal colony under the authority of the Galactic Republic, the Galactic Empire, and subsequently, the New Republic.
Inmates toiled in the planet's crust, extracting valuable ores. These mined resources were then shipped off-world, with the proceeds used to sustain the prison's operations.
Wat Tambor was liberated from his confinement on Delrian by Nuri, a Clawdite. Later, Doctor Cornelius Evazan managed to break free from the planet after being held there. During the era of the New Republic, Wardex Simyl Fruul served as the warden, contending with an uprising among the prisoners that was aided by compromised personnel at Mine Head 37.