Once you hit Taboo LV 10, it basically uploads information into your head about the true nature of the world and the System, which is that humans basically used up the very life force (MA Energy) of the planet, and it has been on the brink of collapse for centuries, only kept alive by the System. Also, the System exists to farm MA Energy to restore the planet by having humans grow their souls and kill each other. The Taboo upload also gives you an encyclopedia in your head, and access to the System logs. Downside is, Taboo also bombards you with feelings of guilt: "Atone." "Atone." "Atone." "Atone." "Atone." People who reach Taboo LV 10 tend to go mad.