I have never been a fan of using Arknell, etc. to jump directly to the Crown of Command. It turns out that this is an illegal move.
From the Talisman Core Rulebook, p. 20: " The last space on the board is the Crown of Command. It can only be reached from the Valley of Fire space, which can only be entered by characters that have a Talisman. "
You cannot get to the Crown of Command without going through the Valley of Fire.
I'm not happy about the teleport from the Lord of Darkness, but at least that's written onto the board. But any other teleport is not allowable.