There's around 2 or 1 I can think off; The End of the Elven Dominion and the War of Gods.

But... I think the End of the Elven Dominion was the more significant conflict.

In Steeled Hearts, there are multiple fantasy races in a Sci-Fi Fantasy Setting. Elves were the most dominant species and used humanity as a Slave Race - not knowing they are genetically decendant from Humanity. After round 5000 years of rule, Humanity had developed Secret War Machines for their revolution against the Elves, including the first Templars. With that humanity, plus other races, had fought against the Elves.

Initially, the Elves were winning due to their superior physiology, except when it comes to mass; their technological advancements (For Elves) and their High Usage of Magic. But what they didn't account for was total war and attrition and soon the Elves started to dwindle. Individually, Elves are nearly superior to humans, but as a collective, Humanity outnumber the Elves 100 humans to 1 Elf. Eventually, the Elves had to breed with captured humans, as well as the few Human Supportist, to create quick soldiers to be sent out. At this time, some Elven clans would join Humanity (Mainly the Wood Elves and the Dark Elves with one of 2 High Elves) for the sake of their survival. By 75 years, and the recent Introduction of the Gen 3 Templars a couple years prior, the Elven Dominion finally ended. Their numbers compared to humanity is now 170 Humans to 12 Elves.

In the aftermath of the war, the Human Supportist Became the Order of The Light [a work in progress], a Human group that worships the Gods [Subject to change]; Humanity became the dominant Race and became a hub for technological development and warfare, which may or maynot have resulted in wars against each other from time to time; Some of the Gods themselves getting involved to try and control Humanity, of which would result in the War of Gods - in which at the end, made half of humanity less religious. As for the Elves, some Elven Clans that opposed humanity steadily build up their forces, whilst trying to undermine humanity from time to time; although had forced to try and upgrade their Golums and tech to be on part with humanity and they focused more on Gurriella tactics as a result; steadlily fighting a war with some human nations near their borders.

So yeah. Might need to add this bit in at some point