 Why was the Green Flame so sought after?
The Green Flame is a radio-active rock once found on Mercury. "When any form of life is exposed to these Gamma rays from the Green Flame rock, they produce in the creature's brain a certain lassitude and lack of energy. The Green Flames might be said to be an inorganic opiate, a thousand times more subtle and more powerful than any known drug." "The archives tell us that one of the first acts of the overthrowing government was to cast out all Green Flames, two of which Vennox had ordered must be kept in each household. Green Flames were supposedly destroyed on all planets after the Vennox regime crashed.
 It was more powerful than any known drug
 It was capable of shooting rays that would destroy every existance.  It was used in warfare and needed to be protected  It was too dangerous to be left unattended  It was more powerful than any known drug