After murdering a diplomat and taking his totally random slab containing the secrets of life and death, my adventurer, Ducim Sealclasps (later known as Ducim Sealclasps the Praised Meteor of Actions) set off to raise an army of critter corpses, then goblins, troll, and beak dog corpses. After clearing out an entire dark fortress, it became clear there was no demon at that location.
I was using legends mode only very sparingly, and my adventurer had become a necromancer long before the opportunity to "power-level", so he was a mixed bag of skills. Starting out as a doctor, with good strength and agility, but then balanced skills in other things like speaking ability, he wasn't a true powerhouse fighter, but was still strong and sneaky enough to get the job done. He was a vain, cruel, greedy loner who had no tolerance at all for those of other races or ways of living. After murdering a few goblin immigrants, killing the diplomat to gain incredible power was hardly even a consideration. Going on a quest to get revenge on the nearby goblin civilization that had nearly made his own dwarven folk extinct was a no brainer (the goblin civ has 6000 citizens and the dwarven one is literally on it's last fortress with no other sites due to war and the like).
He has a few hundred kills to his name himself, but most of the killing is by corpse companion by now. He is stressed out, never focused, wearing broken and completely gore-stained clothes, parched for a drink of alcohol, starved for dwarven contact, and basically losing his mind... but it's only been about 5 days or so--5 days scrambling around in dark pits covered slick in troll blood on an endless murder and reanimation spree though. He found an artifact iron hammer, and a handful of iron gear, some steel gauntlets... really not a godlike adventurer aside from being a player-controlled necro. And, that's all it took. After literally hundreds of goblins killed, he finally decided to head up to what he figured must be the actual capitol fortress.
The shrew brute master didn't see him slinking in up through the hatch cover, nor seem to have heard the hundreds of goblins outside the throne room scream for mercy. The first to draw blood (or goo, as it was) was a beak dog corpse, which was promptly basically blown to pieces by a swing of the demon's artifact bronze war hammer. Soon though, swarmed and completely covered in zombies, the demon was on the ground. Our oh-so-brave necromancer "hero" then snuck up, and on tip-toes as usual trying to see through the mass of writhing flesh that were his killing machines, began bashing the demon in the head repeatedly. Even though it was seemingly made of flesh, it just refused to die, even when it's skull was fractured dozens of times. Enraged, the demon lost hold of it's hammer, and simply crushed one or two zombies holding it down for every blow the dwarf landed.
Finally, fed up, Ducim headed away from the pile to find something else to strike with. It would seem his hammer, so useful in striking down sleeping goblins and stupified trolls was of no use here. Picking up a silver spear off a mangled corpse he began walking back to the fight. However, it would seem the injuries to the creature were not in vain, as it bled enough of it's goo to finally perish before he could return to try to stab its brain. Unfortunately, the annals of history record the event as follows:
"In 100, midspring, (10th of Slate) the shrew brute Fenglel Vicedevil the Spidery Dungeons bled to death, slain by the snodub xuspgastod`s corpse Lyricalswamp in Nightmarespirals."
Well, in any case, not wanting such a creature as an undead companion (and not sure if that were even possible or wise) Ducim instead butchered the thing, and took its skull as a trophy. Of course, the skull was so large, he had to carry it on his back with slithering zombies all around him all the way back to a nice little place where he will suggest to some nice dwarves to build a new home for him... that is, if he can figure out how to be rid of all of these zombies so he can finally go somewhere nice and get a well-deserved drink!