HELP How do i open Riftland?
 

i am level 46.i have done and killed almost everything!i have ''find allies'' and ''stop guilford'' open and 4-5 other minor quests!

After doing all the quests for King Korn a doorway will open that's inside the dwarven mines, where the ladder is (the one you can climb up). When you stand outside King Korn's castle just open your map and you should see the doorway marker called Riftlands.