I'm someone who has returned to the game after playing a month or so during launch. If what I'm talking about in the post is known, please disregard this.
Recently I've developed a mod, and in the process I've learned that things which should be absolutely on the server's side are on client's side.
I'm not going to give the name of the modding tool mentioned in the title, but with it I can basically join some server, destroy buildings, give myself debug mode, and teleport someone to the outside of the world so that they die instantly and can never get their loot back.
I know that this game has no anti-cheat, but on top of that, stuff that should be handled solely by the server is open to being controlled by the client with no checks whatsoever.
Has no one created a griefer mod which destroys a server's world and its online players in minutes or seconds? Is this known in the community? Are there anti-cheat mods/measures developed for such a scenario by the community?
Source: https://www.reddit.com/r/valheim/comments/x0365z/griefing_servers_is_very_easy_with/