"Stalagmite Wars" the aftermath.
Of course after the potent Drow crushed the impotent drow and other denizens of the underdark alike, allies and enemies, and turned the mind flayers into calamari snacks ala cavern they had to deal with the prize. All the females of the defeated city and the impotent floppy futanari females were taken as cumslut slaves to be bred and enjoyed. All other captured races, including the drow males, were made into obedient soldiers.
But it was not that simple. All the inferior futanari, once noble drow priestess mostly, were turned back into females and with the rest of the drow harem they underwent the greatest of humiliations. Their dark coal-black skin was turned white and pale like that of surface elves and their hair altered magically to colors of the high elves. But everyone could still tell they were once dark elves with great pride. They became simply things to be freely used for ones pleasure.
For rest of their lifespan, centuries and even more for some, they would service the potent futanari drow women of the great conquering city as a lower caste of literal cum buckets. Humiliated and having their egos crushed beyond all reckoning they would all lose thoughts of rebellion or of any sort of restoration. All they would think, feel, desire and act upon was serving the rock hard cocks of their futanari dark elf mistresses.
Even the captured females from the surface humans, half-elves and elves would look down on these once drow, now walking loveholes, sometimes cleverly concocting ephemeral futanari potions, a recipe acquired from contact with myconid spirits, and fucking them for their own pleasure as a form of revenge.
Their humiliation was absolute and total.
And the conquest of the underdark continued. There were other drow cities to obtain, full of wet tight warm pussies, and many other races to butcher and subjugate. And the balls of the potent futanari drow were full of cum. That had to be emptied into the most attractive of females, one way or another, from the surface or the underdark.
-So this has sex and violence (blood and gore of all colors and from all sort of creatures) and would make for a pretty good outline of a fantasy sex series in the underdark. The war would be fun to see as well. All sorts of creatures butchering each-other and betrayals upon betrayals.