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Can you tell me a little bit more about where you are? Where is this double skull? To talk to the Great Ling you have to remove the mushroom blocking the way. You do that by finding a sphere in the southeast.
OK. I think you're in the area where the Pergamen says, "Some twins play nice together."
You have to tap the two reliefs that look like skulls in the right order.
You're looking for the Rod of Myces. It's dropped by Mycelius who you can see in the pic above under the word "second". He's in the far mideast behind a crackable wall.