A bleak ... doomed planet facing impending
annihilation from its belching red sun
Gallifrey (q.v.) once used Centros as a place of exile... for one of their most evil villains (Varnax)... but it was then abandoned for a very long time.
The renegade Time Lord Varnax enslaved
the people of Centros for many centuries,
turning them from a happy, peaceful
people into ferocious, hallucinating
warrior monks.