Oh, holy shit. I was not prepared for this.
I was only approaching the freakshack when I heard the calls to battle from...four, six, eight, nine, ten, then more, a hell of a lot more than the eight I was promised. So I started to work on them, and managed to decapitate two in one shot before I was detected. There's no way I could find cover against that many, not without running further away than I want to, so I weaved around the trees and lured them in one by one, doing some pretty swift execution for the little axe skill I had. It was working out well enough that I didn't even bother to sneak, and just hacked away, going for the headshots and getting them if not immediately then eventually.
When I finally found no one chasing me, I walked around counting heads, all of which were cleanly separate from the bodies, I found 13. That warlord bastard lied to me! Now I regret letting the treacherous spunkwad live when he was in arm's reach. Oh well. I was getting drowsy, so I headed inside for sleep first, then inventory the no doubt bountiful loot in the morning.
As soon as the door opened, another pack of night trolls were telling me how awesome they were. I backed away, and this time I went for the stealth. Again, I only got two before they detected me, and I had to lure them out one at a time, at least another 6 but by that point I stopped counting. When there was a handful left inside -- again, I stopped counting, so that might be a handful for someone who has seven or eight fingers -- I was able to gradually whack them stealthily.
If any adventurer deserves a rest after evicting all those trolls...but instead of sleeping, I circled around to survey the site and memorize the layout. And yet another night troll came at me, a bride of someone whose marriage was probably annulled by the sharp end of an axe. I counseled her to get over it with the same axe.
I still haven't looked at the loot or bodies, but my axe has a headcount of 30 kills, all of them night trolls. See for yourself: