6dc5455c____The_Coppermind___17th_Shard__Entry
[Chapter] 55 [Entry] 
By sacrificing most of his consciousness, Preservation created Ruin's prison, breaking their deal and trying to keep Ruin from destroying what they had created. This event left their powers again nearly balanced—Ruin imprisoned, only a trace of himself capable of leaking out. Preservation reduced to a mere wisp of what he once was, barely capable of thought and action. These two minds were, of course, independent of the raw force of their powers. Actually, I am uncertain of how thoughts and personalities came to be attached to the powers in the first place—but I believe they were not there originally. For both powers could be detached from the minds that ruled them.
The Hero of Ages/Epigraphs - The Coppermind - 17th Shard
Entry