In Assassin's Creed Valhalla Siege of Paris, you can come across Cairns that will earn you extra points. On this page, you will learn where to find Cairns in Melunois.
You will find the Les Trois Pignons cairn in the northern part of the region, west of the sync point.
It is not an easy task. You have to arrange the stones so that they stay upright, this is the only way to reach the designated height. Arrange the stones so that they rest on each other and do not fall. Pay attention to their edges - if their narrower ends are flattened, it will be easier to place them upright. And if they are wider - horizontally.
This cairn is stacked best vertically. Try to match the bottom edges perfectly, so nothing falls off. This may not be the most stable construction, but it should make it easier for you to solve this task.
By completing this task, you will receive an extra skill point.
If you run into a situation where you can't even place two stones, simply reset the game. There's a good chance that something is bugged - you won't be able to finish that cairn.