Don't have the rules in front of me, but I'm pretty certain that there is nothing that lets you skip _any_ of the Inner Realm space - all spaces must be encountered one by one. There are things that improve your odds at those spaces, even to the point of not needing to roll, but you still have to encounter those spaces. And the act of getting to the top without a Talisman sorta goes against the whole idea of the game.
There are at least three ways that I think officially work.
Dungeon, best the Lord of Darkness by sufficient amount.
Dungeon treasure Cloak of Feathers
Highland relic Arnkell
I think the Black Ice spell specifies that it can't be cast on a space in the Inner Region. Correct. The card says it doesn't work in the inner region.