In multiplayer, biters only bite player 1, they ignore the others.

https://imgur.com/a/80lqjuT

Tried it with just Lignumis and its dependencies to confirm it's this mod causing it.

Using just Lignumis' dependencies everything works fine, as soon as I activate Lignumis itself enemies ignore player 2+, which also includes Demolishers. The recent changelog doesn't mention a fix for it either :(

Sorry, I didn't have a look yet.

I'm sorry, but I really have no clue. Can you send me a savegame?

As part of testing we realized this happens on a fresh savegame. I can still send you one, but this information might be sufficient?

Just Lignumis + dependencies right?

Yep

I'm noticing this issue too. After some tinkering, it seems that non-player 1 characters are made indestructible by Lignumis at some point, because I was unable to damage the player via any means at all, even through other mods.

That's a good hint. I have a fix ready for release :-)