Did you try to get the that's behind Merlin? If yes, but the game won't register you've clicked on it / put in inventory, try clearing the game cache or reinstalling the app (make sure you create a login before uninstalling.)
If nothing helps, create a SUPPORT TICKET via the button under the game settings wheel (upper left corner.)
Once on the page, scroll past the white search 🔍 box & choose a category to begin the form.
If the categy options aren't visible (iOS device) then email SUPPORT insread: firstname.lastname@example.org
Be sure to include the Player ID# (also under settings.)