"Beware The Eyes Of Green": Who, Exactly, Are The Haranir?

The "mysterious guardians" dedicated to the roots. Part-troll, part-elf, all enigma. Who are these haranir and what's this sacred duty that makes them so cold and mistrusting? Let's not forget the Black Blood Orweyna, specifically, is worried about.

"Beware The Eyes Of Green": Who, Exactly, Are The Haranir?