Ben Bulben cairn is a mystery to be solved in Assassin’s Creed Valhalla’s newest DLC.
Your task is to stack the stones until they reach the required height.
Here’s a guide on the Ben Bulben cairn in AC Valhalla.
To begin the cairn challenge, head north of Connacht. The exact location is shown in the map below, indicated by the player location.
How to stack the stones
Interact with the stones to begin the cairn challenge.
You’ll be given five stones in the area. The biggest stone can be used as a solid base.
This is followed by a vertical stone, a horizontal stone and finally another vertical stone at the top.
You can follow the formation in the image below. Once they reach the required height, validate it and you’re done.