I made it to Vulcanus a day ago and just noticed when I was playing today that I could only find remains of Demolishers. So I went far off and found Behemoth ones. They were still alive, but receiving constant damage they were able to survive due to their high regen.
Looking around and googling it.. supposedly its due to "This behavior is exactly what happens when the global Itaverax passive environmental damage aura is accidentally or intentionally leaking into other planets like Vulcanus".
At least thats what the LLM thinks.
I did try disabling mods on and off and only find that disabling Abacayba by itself, stops whatever DOT is effecting and killing the demolishers on Vulcanus off.
I've only been to Abacayba a bit, and had to reload a save before I went there as I couldn't handle it at all yet. But while I was there. I saw no on going damage like that there.

thanks for the repport, will take a look latter

Thanks! I'm on 2.0 by the way. Also, thanks for the mod, I do like what I've got to mess with it so far. I'll eventually go back to Abacayba when my damage research is high enough to actually survive more than a second or two.

i will try to reproduce that in 2.1, also, send your factorio-current.log, so i can check if its some mod-mod iteration