After unlocking the Glade of Trust and Dazzle Beach area, you’ll unlock new characters and one of them characters is Mother Gothel. Mother Gothel will give you a quest named ”My Kingdom For A Scroll” in which you want to get the Sun’s Scroll for Mother Gothel.
Finding the Scrooge McDuck’s Key
Sun’s Scroll has been kept away hidden by Scrooge and Mother Gothel will tell you to get it for her. You’ll need to trick Scrooge into revealing where he hid the Sun’s Scroll and you’ll learn that he hid it in the locked chest near the Mystical Cave which is in Dazzle Beach. The Key to the locked chest is somewhere in the Glade of Trust area but Scrooge will not tell you it’s the exact location.
You need to go to the Glade of Trust area and go towards the Waterfall area on the North side. When you reach the water, you’ll see a Golden Circle in the water. You need to equip the Fishing Rod and cast the line in the Golden Circle. Just do the same process of fishing in the Golden Circle and you’ll get the Key to the locked chest that Scrooge hidden. If there are more than 1 Golden Circles in the water then you need to fish in every circle to find the Key.
Once you have found the key from the water by fishing, you can return to the beach and unlock the chest to obtain the Sun’s Scroll and give it to Mother Gothel to complete the quest.