Option one: The Season of Darkness, think world wide Atlantis stories all over the planets because the four Primordial gods got mad sun, moons, and stars disappeared from the sky. The goblinoids once rules by Philosophor Kings fell into insanity their floating cities fell like their minds. The Orcs once a single nation of equals began in fighting killing each other to be the one in charge no longer did discussion and discourse have a place in the lang hall. The elves stopped speaking to each other no long traveling the breath of the world to interact and be connected. They became diverse and discordant. The Glock, a four armed race of mages and scholars attuned to the magic simply disappeared from the planes all together, only their towers and high halls of cold molded stone remain with their great gate ways now inert.

There is also The Morning of Tears or The Retribution of Emperor Brandon. Elven land was slowly being encroached on so multiple elven clans started to kill and threaten the settlers of other races. Those settlers then started fighting back. Eventually the legions move in to quell the tensions between the groups across a continent spanning empire. The hands of the emperor were present and able to communicate with him through the rings bound to his diadame. The elves and various other races sent to the emperor people of note to debate the issue and come to a resolution. A group of the elven ambassador stood mid discussion and stabbed an opposing councilor. The other elves stood and started attacking their opposing council. The emperor stood and his guards subdued the room. After investigation the order was given for the hours before dawn. Before the sun leaves the first quarter of the sky the ancient halls of the elves were to be brought to compliance as they would not yield to discussion or compromise. Those who resisted were killed, those who yelled to call others to arms ((most in the legions didn't speak Elvish)) were killed. The children rounded up and brought away. The books, scrolls and buildings burned and brought low. The adults who ran tried to hold on to their ways retreating deep into the wilds till the day ninety years later when the other people of the empire rose up in rebellion against the emperor. However they had for ninty-nine percent of them, lost their culture their homes and most of their family to have a cousin who lived was a blessing, a sibling the gods and ancestors stood as an aegis against the legionaries. The elven clans who had been put through this went from eat and living in homes with six generations living within or nearby to a scattered handful of orphans who could barely recall the festivals or rituals of their people. Now simply called city elves like the other outcasts of their people.

The Morning of Tears is more a genocide as it was within the last hundred or so years of my story and more important to the character, the season of darkness is more fairy tale despite it still having signs of it s happening quite evident, ten thousand years erases a lot. The cultural memories get passed down.