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 Ulster region.
You can find the mask on the banks of the Lagan River.
To get to the mask, you must destroy the obstacles blocking the passage. You can do this using the flammable vases or the special skill, Incendiary Powder Trap. Once you are inside, run to the very end and pick up the mask.
You will find the mask in the southwestern part of the region.
To get to the mask, you must destroy the passage. You can do this by simply shooting at the fragile boards. Once you are inside, run to the very end and pick up the mask.