[quote]Any knowledge at all about the precursor's creations that predated the forerunners and humans - the previous universe itself?[/quote]No. [quote]Indications about their true intentions in the universe?[/quote]To create life. Now it seems it is to oppress all life. [quote]Does each precursor possess a distinct personality while remaining a hivemind?[/quote]That is entirely unknown, including if they are a hivemind. [quote]Is there a precursor hierarchy?[/quote]Unknown. [quote]Yog-Sothoth vs. Precursors; who prevails?[/quote]The true extent of the Precursors is unknown. Yog-Sothoth's nature and extent is better understood, so I can't answer the question adequately.