Hi Dakota EmeraldBlade. Thank you for once again asking a question on the forum without spending any time looking beforehand for the answer, which is a sticky in this very forum!!
to get to that pass you had to pretty much finish the pyramid.to get to the next area in grizzlehiem you need to do the same with the sphinx area. next you must do the same to hyde park. then you must finish the first section of mooshu (get help for this one it will go faster and you will die less). i don`t remember when you do the last grizzlehiem area, sorry