Secret area III! Trophy in Ginger: Beyond the Crystal

This is found in the hub world of Crater Peaks and can only be accessed once you have the Dragon and Vampire costumes. It is in the north east of the area, just across the bridge from the town. You will see some bats flying over a white circle so use your Dragon costume and breath fire on the bats, then change into your Vampire costume and stand in the circle. Use the prompt to be flown down to a lower level and the trophy will pop.