There will be several Merlin Trials throughout Hogwarts Legacy, and there's a tricky one for you to complete close to the North Ford Bog. This location will take you to the top of the Hogwarts world map, where you'll need to complete another completed Merlin Trial.
How to Complete the Merlin Trial at the North Ford Bog in Hogwarts Legacy
The Merlin Trial is east of the North Ford Bog Floo Flame fast travel location, close to Hogsmeade's northern boundary. You may travel to this location on foot, but we recommend using a broomstick or flying on a creature to get to this location.
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A few large rock pedestals will appear on the cliffs next to you when you arrive and activate the Merlin Trial. You will need to cast the Confringo spell to destroy them. However, there will be three hidden rocks you need to uncover. Use the Revelio speel to identify them.
The only way to avoid these vines is to cast a Confringo spell, then use it again to destroy the rocks. Once you have destroyed each of these rocks, the Merlin Trial will be finished, and you may continue to explore this location for any other hidden treasures that have been eluded you.