Not a developer nor Valve, So you can take my answer with however much salt as you'd like.

But the answer is 'Yes'.

You also aren't likely to get an answer from the developer; And you definitely will not get a response from Valve in this topic.


For this specific game, If you trust the source from which an external mod comes from, Then it is safe to use it.

For most other games, It's GENERALLY safe to use external mods; Especially if it's a singleplayer game.

The games it wouldn't be safe or that I would be dubious of have VAC protection (Valve Anti Cheat) or some other form of cheat protection. And even in those cases, often mods are safe to use. EG: L4D2 has VAC protection but you can mod it up anyway.

Speaking generally, if there's a presence on a well known modding site like NexusMods (https://www.nexusmods.com/valheim/mods/) then it's pretty certainly safe to mod the game.

The Steam Workshop isn't really about making mods that are 'safe to use' with the game; It's about ease of access for the end user. Instead of having to fuss around with files and extracting them to the right location, etc, etc, you can just click a subscribe button and go.

The workshop also puts the file control in Valve's hands, So the risk of getting a malicious file from an untrustworthy source is heavily mitigated; Which is very useful for people that aren't computer or internet savvy.


Anywho, the TL;DR is, You're fine to mod Valheim up with external mods; Install Valheim plus and have a blast. Just make sure you can trust the source from which you get the mod and verify that the source is actually the source- Typical computer etiquette stuff.