In Assassin's Creed Valhalla: Wrath of the Druids, you can come across the Ui Neill Artifact, one of the collectible items. On this page of our guide, you will learn where to find masks and how to reach them. This will make it easier for you to max out the Meath region.
You will find the mask in the eastern part of the region.
To get to the Artifact, you must destroy the cluttered passage. You can do this by using jugs with oil or the special ability called Incendiary Powder Trap.
Once you are inside, run to the very end and pick up the mask - it lies on the left.