Being from the element of Light, Luminous has always feared the dark. Even his own shadow used to frighten him. So he became determined to find the source of light so intense that no amount of darkness could exist in its presence. This quest drove him glaringly mad and he set out to destroy all who opposed him. Finding the Starlight of the Radiant Realm, Luminous sought to steal it for himself and attacked Radiant City. The Trap Master, Knight Light, fought the Doom Raider to protect his home realm and was locked in battle with Luminous that lasted several days. After the fight, Knight Light emerged victorious and Luminous was sealed away within Sunscraper Spire.
In Trap Team
In Skylanders: Trap Team, he takes the guise of Mags in order to convince the Skylanders to reanimate the Sunscraper Spire. When his power is restored, he reveals himself and fights the Skylanders, though even with his restored power he is defeated. He seems to accept being sucked into a trap, even diving head first into the vortex..