Read the grimoire on house of wolves too.. it shows a conversation beetween mara sov and eris... and hints the taken king dlc... also kinda explains why the awoken went and wipe themselves to stop oryx and also says the guardian is the key Also with the taken king grimoire... you see an old proto hive called taox.. wich was the stealer of the throne for oryx and his siblings, they wanted revenge but taox escaped... now this a very crazy conclusion. .. but I think taox... is mara sov reborn Now to even add a more intrigued story..... eris says she also works with osiris... so just picture this.... all character we see... the stranger, eris, mara sov, osiris, form a special group that we dont know what the true intentions they have but have helped us, guess we will eventually find out