Feel free to share experiences, thoughts, or other comments. Watch out for the necks, though; they may sing, but they are not particularly friendly.
Finally managed to get few screenshots from the other PC. So the story goes...
Me and my boyfriend were playing Valheim a LOT at some point. It also started to become a habit, that when my boyfriend went afk for like 5 mins, "Forest started moving". Or something even worse.
I had made a beautiful beach house for us and because of reasons above, I also fenced the whole area. Now we had safe place for our boars, boats and buildings. One day my boyfriend went afk again for a moment, and
right at that instant "Forest is moving". I had just eaten something crappy for gardening stamina instead of health, so I wasn't able to eat any HP food (this was before puke berries). There I was in the middle of grumpy trolls, all alone. Things got even more fun when I realized that trolls were able to reach our boar pen behind the high (wooden) fence and were smashing that to million pieces. We had several three star boars in that pen and those were very difficult to find in that area, so I rushed there and tried to sacrifice myself for saving the boars, but I was too late.
All boars died and I escaped back inside the fenced area, only to realize that trolls are smart enough to go around the end of the fence which was at the shore. Somewhat close to that point was also our main building. Troll completely ignored me and started to smashbash our main building. It broke half of the big house, beds, storage chests, portals... I'm not sure did I cry or scream. Total disaster.
Ever since then the almost first thing I do when building a base, is to build
huge and HIGH stone wall around it. And place the animals, crops and buildings
far enough form it,
in the middle of the area. No more trolling at our property! I think
@SigilFey may have laughed and called it the "wall of China" when he saw it first time. But yes, there is a reason for that mighty wall! I also make the wall ends to go as far from the shore as possible. So far it has worked. We have survived several attacks (plains next door) and base is still untouched.
Still those "AFK attacks" happen so often, that nowadays we also park ourselves somewhere far away from the main camp if we have to leave the PC for a moment. If there is only one character at the main camp, it seems to help a lot (won't completely stop the attacks, though).