Zone into Draniks Scar. Follow the left zonewall down the hill. Just a bit before you get to the bottom of the hill (and you'll see some buildings with murkgliders, nocs, and other nasties wandering around, there's a Dragorn NPC. Don't remember his name offhand, but when you hail him he says something about being crazy and having glowing eyes.
Follow his text, hand him a rune. Get the first tome for whatever level rune that is. Level 66 is minor runes, level 67 is lesser, and level 68 is just plain muramite runes. Level 69 and 70 runes are no-drop and hopefully you'll have it all figured out by then.
Alternatively, you can simply read the
quest description...