Prysmos is the planet on which the Visionaries series is based. It resides in a Tri-Star System who's suns appear blue, green and red. The blue sun is the hottest, with temperatures reaching over 10,000 degrees and the yellow sun is the coolest, burning around 6,000 degrees and the green sun burns at around 8,000 degrees.
If you are wondering, planets in a Tri-Star system only orbit one of the suns, the other two, although in the same solar system, would act like normal stars. This is different in Visionaries, where all three stars appear to be orbited by Prysmos
Prysmos is based in a far away galaxy and is a very ancient planet. The inhabitants (who as a species are never named) are a humanoid race which have lived on the planet for a very long time. All that is known about the history of the people of Prysmos is that for the last 7,000 years they have lived in a time of peace and technological splendour. There is no indication to what life on Prysmos was like before this time, nor how long they have been around on Prysmos (for example humans have been on the Earth for around 4 million years in one form or another).
Prysmos was a very technologically advanced world which was split up into many kingdoms, the largest of which is New Valarak. To the west of New Valark lies the city of Khemir, the most advanced city on the planet, with it's awe inspiring spires, aerodynamic vehicles and vast factories. Khemir's inhabitants, the Khemirites, were of noble birth, each of whom had robot workers.
Prysmos shrived until a cataclysm event, the re-alignment of the three suns, which lead to the disruption of all electrical forces on the planet (like a giant Electro-Magnetic Pulse). The effects of this were devastating, and civilisation as they knew it collapsed. After some time (it is unknown exactly how long, although the indication is that it was only around 5 to 10 years) a new order arose, although more primitive and resembling the Medieval Times on Earth.