I have random Seekers coming at me ^^

I just read an article today that the devs are going to have difficulty settings for each new and already created world in a coming update. So you can turn off raids or make them more frequent, make combat harder or easier, no cost building, passive enemies, portal items like ores, it's gonna be a neat addition if you wanted to turn things like that off. :)

If you have beaten Yagluth, fulings will start to spawn in the meadows at night. Not sure about other biomes.

if you have gotten to the plains after beating moder then any workstation can be targeted by a fuling raid.

and unless you're at that workstation, you won't get notified other than the red circle on the map.

this can lead to fulings just randomly wandering around your meadows bases, or if you have beaten yagluth like Suzaku said they spawn naturally in meadows after that.