I haven't had a single raid yet on day 83, though I did have the necrotic rain and two howling spiders that for some reason appeared unannounced. Clearly no animal in my map were infected yet spiders popped out of nowhere with no event notice, which is a bit cheap and might make me uninstall the mod by itself if intended. They're strong enough by themselves but if I have to actually check if one is attacking me every single second and can't even play on fast speed because of this mod, this isn't worth it.

The enemy spawners from corrupted drop ships also multiply themselves into infinity.

I barely had any mod events, except raids. Had a flesh pit only once but I easily burned it without anyone appearing. 2-3 ships, weren't much of a challenge considering that I burned them as well with mortar fire.
Howling Spiders (or other unique necronoids), however, appearing annoyingly often.