In a fortress I just began recently, I noticed that the goblins were lead by a demon; a grey devil precisely. No big deal, right? It happens a lot in world gen. Anyway, I decide to check out the guy in legends on a whim.
Looks pretty normal; but then I noticed there's more list to scroll through. A lot more.
Yes, that is 7,000 dead elves.
His conflict with the elves had lasted two wars. The first was quick and brutal.
It only lasted a single battle, and elves actually won it, despite the horrendous and embarrassing casualties they suffered.
However.
10 years later, in 209, Mavi lead the goblins again in the Barbarous War, this time against a different civilization. When worldgen stopped in 350, the war was still ongoing - so far 141 battles and subsequent pillaging had occurred, usually ending in the elves being mutilated, devoured, or stuck on spikes.
In the roughly 150 years he was at war with the Elves, beginning in 199, his kills totaled 7354 elves, 60 grizzlies, and 47 pandas. Entirely elves and their entourage; no stray dwarves or humans, or even livestock. Whats more, is the entirety of the second war was waged in the same city; Contestcloistered.
Only then did I remember, while scrolling through the thousands of elf impalings and devourings, that Contestcloistered was my mountainhome, and the Square Stake was the civilization I had embarked as.
A lot of legends sleuthing later, I worked out most of the details. The last dwarf king, Cog Cavevalley, had died in 177, and wasn't replaced until 210, a year after Mavi's first assault. He was replaced by a pair of elves, who I won't bother naming, because they were killed off in short order by Mavi the next autumn. From looking at older battles, I noticed that elves were slowly replacing dwarves in the civilization since the year 109, when Contestcloistered was reclaimed after a series of unfortunate wars. By 177, the dwarves were nearly extinct, and Cog's death to a female twilight horror was the last recorded event at Contestcloistered until 209. In 349, the year of my embark, the population of my civilization was exactly 538 elves.
I also noticed something I had overlooked earlier, while scrolling through Mavi's kills. All of the duels recorded there were against the Elf Kings of my civilization, which they would inevitably lose and be promptly replaced by two fresh elves. And the attacks occured like clockwork, every autumn.
While it's probably some weird recursive bug with world gen, I can only imagine it as some kind of bizarre elven blood ritual, in their attempt to emulate dwarven culture, where a new king was chosen each spring to be given as a sacrifice to the demon to ensure survival for one more year.
Edit: Apparently he's stuck in a loop of infinite elf-killing.
This is after 7000 years of running world gen. I sort of feel bad for him.
Edit2:
Well I'll be. I ran out the world gen to its limit, 10,000 years. In the year 7431, he fought the only living dragon left in the world, lost, and died in dragonfire. Grand total of 31,062 kills. Sadly that's all the details I have, as trying to dump ten millenniums of legends into something viewable crashes my computer. Anyway, going back to working on my fortress and messing with the predetermined timeline.