Hyrule Castle is connected, or at least I could have sworn it was... The river just goes through some grates, but it's all the same river...

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In the crazy lands between awakening and sleep, I wait, and I think on everything Zelda.

"Let fear be cast into the hearts of our enemy.
Let them lose all hope and let their heart sink into the unending darkness.
Let them have no will to live.
Let them feel the power of the Sages of Despair!"