Not a fantastic title, but didn't want to put any kind of spoilers in the title. The Librarian tells Chief that she 'planted seeds' that lead to his inclusion in the Spartan II project (so probably the project itself) as well as his Mjolnir armour and Cortana. How is that possible? Or do we just dismiss it as forerunner magic? I really liked the way Chief was meant to kill the Didact, I just wish I could understand it more!