To everyone who is a tad disappointed with the passiveness of people when starting a fight in their town (whereas for me it never was that bad as I always had several people joining my foes when I tried to kill someone):
Gen a world where an undead invasion occurs. You will love that carnage.
My undead peninsula from my world that I'm currently running is a place where such an invasion did occur (and it's still ongoing). The group-civ of the necromancer who started it all has control over 42 sites formlery belonging to normal human/dwarven/goblin civs: A large realm of horror.
The fun fact of this: Not all of these sites are filled with zombies but instead nearly half of them still contain humans, dwarves, elves and goblins. And night creatures who are normal citizens. Five of these places just contain night creatures - and I asked myself: Why this? Well, I've got the answer.
By just visiting the first hamlet which was full of normal people and which, in the past, just got conquered by the necromancer-civ without killing them all.
And, oh boy, this visit turned out to be the bloodiest visit I ever had in DF.
The anser is just simply: Ghouls.
Upon entering I started a little talk with a three-eyed night creature who was wandering around for some water from the well. While we were chatting and joking a goblin holy morality ran past, tears in his eyes. Sibrek Silverword (who in reality was Ngerxung Ghoultusk (and this name made me laugh pretty hard - in retrospective), who disguised himself for whatever reason - I have Legends Viewer always running while playing to learn about the creatures I'll encounter), coated in some splatters of his own blood because of a little wound on his head. Gipest Gloriestrampel, the Tiquorod's fist gelder, and I looked somewhat surprised but didn't interrupt our little leisure time at the well.
Another holy morality, this time a human one, ran past - tears in his eyes and with some splatters of his own blood.
I got somehwat concerned.
Especially when a dwarven holy morality appeared around the edge of a crumbled building, blood oozing and pale. Followed by an elven tainted ghoul. Who closed the distance to the dwarf, bit him in the throat and shook him around until the priest bled out.
Slowly I backed away while Gipest walked by the elven abomination without any attacks of it. Night creatures...Ghouls don't attack them.
Without any notice of the ghoul I could get away and followed the two priests who were fast enough to flee from this undead onslaught. Until I saw the battle messages flickering and I could read "The goblin holy morality tainted ghoul Sibrek Silverword..." and I thought to myself: This will be interesting.
And it was. Utter chaos and bloodshed. The two priests, now turned ghouls, teared through goblins, dwarves and humans. Scratched them, punched them, kicked them. And bid them. Soon there weren't just the two ghouls but half of the normal combatants began to change into ghouls. And more and more unturned people threw themselves into the fray against this undead menace. No running away, no "I must withdraw" - no, they voluntarely entered the fight, drawing their knives, spilling the ghoulish blood, killing them and in return got infected. An endless cycle of slaughter.
Some time later (a long, long time later) the battlefield cleared and just one ghoul was standing (well, dragging himself across the ground as both his feet had been exploded into gore). But, hell, this bugger was fast as he tried to reach me. He nearly got me while I was running away - looked upon by dozens of night creatures who had witnessed this turmoil and never had to fear the ghouls. In the end, 58 people of Sunkbored were slain and/or turned into ghouls (and were slain by other people or by the ghouls themselves as they didn't care who they were killing. It was utter bloodlust and everything was clawed to death.). A spectacle to behold.
Now I was thinking that night creatures are a lucky bunch of dudes in this region...
...until I reached Leopardact, another hamlet, controlled by the necro-civ and only inhabited by night creatures.
There, no ghouls were present, but some time ago a necromancer had revived some night creatures into frozen zombies. Sentient undead being who were in a loop of constantly asking "Identify yourself!" Not every night creature would or could do this in time and a new slaughter began: Between Tiquorod's fists, hulking and tough, and Tiquorod's fist frozen zombies, even more hulking and tough. And fast. Damned fast.
After slaughtering nearly half the village while more and more normal night creatures joined the fight, there were just two zombies left, but I retreated. In fear. A shameless display, I know, but these locations are truly f-ed up and I won't stand a chance as a mere peasant.
My hope lies in swimming across the ocean to reach the mainland.
And by not catching the curse of becoming a ghoul - else this whole world will be doomed.
God, I love these new changes. Undead invasions are truly deadly. And fun for adventure mode if you want carnage and killing frenzy nonstop.