: What/Who the hell is Jjaro and Yrro? And was Marathon built around a planet
: or something? I thought it was never clearly explained.
Jjaro are beings that lived millions of years ago and were incredible advanced. They left technology behind, witch was used by the Pfhor and to create the marine. Yrro is believed to be a mis spelling of Jjaro, it/they trapped the W'ancrtre (i have no idea how to spell that) in L'owan's sun.
The marathon is mars' moon demios ( im pretty sure it was demios, of not the other moon.)