Curse of the Underdark

There is a powerful curse going on and it turns many women as 'futanaris'. The origin of the curse is quite mysterious,
but it comes from the Underdark.
The reason there is a curse going is because of a thirst in power from a Dark Elf.
She read a forbidden book and it curses her entire family and anyone near it.
Meaning several Dark Elves families...
But the curse is so powerful it affected Monster girls and women of the surface.
One of them is Queen Katselia, the Queen of the continent.​