You need to cahnge the requirements for this quest because, you need 41 agailty to climb the rocks to get to The Diamond of Ice which you have to go thorugh trollheim.

I think you tried to use one of the agility shortcuts and not an actual obstacle that you HAD to cross. The requirements are right, you only need 15 agility to cross the obstacles that have no other way around them, like the ones coming directly after death plateau.

well that one fence you had to jumb over to get to troll heim was cut out now you have to go by all the trolls that throw rocks at you to get to death plaeau and then theres a leage that you have to climb to get up then you can just walk thorugh