Venonis has plenty of wealth points of interest around it in Assassin’s Creed Valhalla. There’s a book of knowledge, a resource, and a piece of gear. Of the three, the gear piece is likely the hardest to obtain because it’s behind a locked building, and inside there are a few enemies you’ll have to fight or sneak past to obtain the armor.
There won’t be a clear indication of how to get inside this building. The holes in it are protected by iron bars that prevent you from accessing it, and your arrows won’t destroy the weaker parts.
The barred door is the only entrance, and that’s the key for you getting inside. To access the building, go to the top of the roof, and look for the line of rope connecting the building to a tree with a platform. Proceed to the first platform, and then the second platform connected to it, so you’re facing the side with the large, partially broken wall. Peer through the small slot, and you’ll be able to aim at a pair of planks holding the barred door in place. All you need to do is give it a well-aimed shot, and you’ll be able to gain entrance to the building.
Once inside, take out the pair of enemies protecting it, and proceed to the gear chest behind the second floor’s breakable door. Inside will be the Hrafn Guard light shield.