Each class has legendary skills that start in rivendell with a deed book. To get these skills you have to kill mobs in key places. Such as Angmar or the Misty Mountains.
Well you don’t have to do it that way.
Sometime before Isengard, Turbine made the the pages for these books drop off of orcs and goblins in Moria. It is very easy to get them as you quest.
Infact I have helped kin members grind all the pages out in under two hours.