Eternal tower, the task of fortune-telling grandmother ~

You may have taken the wrong mushroom. When you finish cooking mushrooms, you will become like a mouse. What's under the tree at the intersection on the left and on the right of the fortune teller? That mushroom is very big and should be easy to find. You can tell at a glance.

PS, there is only one mushroom. You said there were many. I am very responsible to tell you that you probably took the wrong props.