I decided to make a military embark near an dwarven hillock taken over by a hostile elven civ. First announcement I got was "You have discovered Palymis". I checked at the units screen and there were over 130 kobolds, all of them hostile, most of them wrestlers, apparently, on the top of the mountains. Although they are marked as hostile, the two 'bolds next to my wagon (a ranger and a trapper) don't attack the militia I panickedly made before even unpausing. They are just standing there, watching.
I holed up quickly and decided to leave the northern half of the map as kobold land until the Elven siece (that will probably come from the north aswell) wipes them out or the loyalty cascade caused by the kobold thief thins them out enough for me to take all the shit they gathered (although mostly it's empty chests, crates and a bunch of dresses, which is disappointing, since Legend Viewers showed kobolds that stole divine metal crowns from fucking vaults, but oh well).
I checked Palymis on the Legends Viewer, and apparently they were settled in a cave once, but a nearby human civ decided to attack the cave for no reason, sending their entire army at them and not killing a single kobold, instead driving their entire population out into the place I decided to settle.
This will be fun.