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It is called the "Forbidden" Path because only fighters who have proven themselves worthy in the Zaishen Challenge may walk the Path and enter the Zaishen Elite refuge.
From the side of the Zaishen Challenge the Path is blocked by a gate, guarded by a Guard of the Isles. The Guard will only let you pass if you have the quest The Path of the Zaishen Elite on your Quest Log. Otherwise he will refuse to talk to you.