Torsteg

Torsteg is a mighty Fremennik found at the castle east of the Wilderness, which could be the source of the strange power. He is guarding the castle along with Hilda, and neither of them will not let players through.

Trivia

 * If a player persists on going through the gate, Torsteg will interrupt the player with the line "YOU SHALL NOT PASS!" which could be reference to a line from Gandalf in the film The Lord of the Rings: The Fellowship of the Ring, in which Gandalf yells the same phrase to a balrog.