With that adventurer I eventually decided to venture underground and got smashed by a Deep One.
Generated a new world, I start in the only Kobold city left, standing next to a cathedral-whatever-like ruined building with a ramp leading to the first underground level. I enter it, and find a pool occupying its center with four doors on the sides, leading to narrow catacomb-like passageways filled with skeletal kobolds (they bothered replacing the clay from the layer with stone blocks walls and floors, but not placing coffins for them? There were only THREE coffins, complete with memorial slabs), those kobolds were all either peasants or named ones. Going further, I find open rooms containg clothes, armors and weapons. In the meanwhile I heard military Kobolds coughing blood. So I think: "Perphaps there is an invasion going on and there are Kobolds still fighting underground! I must help them!
". Equipped with looted armor pieces and a mithril pointy stick and aura, I finally find the Kobolds soldiers. And they just kill me.
Later on I check the population with LW, and it turns out half of the Kobolds living in the town are outcasts living right below the others' feet. In the town there are also a few domestic animals and some goblin and drow merchants. There is also a castle, with kobold nobles (but no guards) living in the upper rooms while goblin and human outcasts play Connect Four in its cellar.
EDIT: I managed to separate three kobolds from the group and kill them individually (throwing a knife makes miracles). Afterwards I get spotted by a bigger group and have to retrocede, the rape train composed of Bola-thrower, a Slinger and a bombarder. Arrived at a narrow passage, I throw a knife at the Bola-Thrower, he promptly dodges it and it lands on the bombarder behind painfully wounding him. Now, trying to fight back, I get dragged past the stunned bombardier and face-to-face with Bola-Thrower. I wound the bola-thrower and then kill the bombardier from behind by bashing my aura on his head (he didn't have the time to turn on me). I keep fighting off the bola thrower (eventually I make his groin sail off with the throwing knife) when the slinger starts lashing me with her ironbone sling (that thing must have been sharp), easily hurting me. Worried by the injuries, I fall back into another cathedral-like building with a pool in the center, being chased by the sling-lasher by the edge of the pool. When she cuts open my shield-hand, I panickly jump into the pool taking a fall of 2 Z levels. This one building wasn't ruins, and in fact there a was whatever-noble/priest some tiles after the one I jumped in the pool from and a stray drowspider. I was worrying about that whatever-noble (and most of all, about me), but then this happens.
My current situation.
I made it with a cut open hand and a couple of bruises. Anyway, what kind of shield is an aura?