Where is Riser's Genesong?

It was stated in Halo: Silentium, that Chakas (343 Guilty Spark) is on a personal mission to locate the Forerunner Lifeshaper, so that he can locate his lost friend Riser, or rather he essence… however where is he or who is he?

riser wasn’t a she?

> 2533274800656155;2:
> riser wasn’t a she?

I was referencing Yprin Yprikushma accidentally…