In Warhammer, I Am the Witch Queen and the Phoenix Queen

(The protagonist is Morath during the First Chaos Invasion. He changes history from the place where his dream began and saves the world.)

I was arranged to transmigrate to Warhammer Fantasy.

Great, at least it isn't 40k!

I transmigrated to the era of the First Chaos Invasion.

Great, the point in time is very early, so there is plenty of room to maneuver!

I'm a major figure among the elves.

Great, the strongest Order-aligned race in the future. As long as I prevent the elven civil war and the War of the Beard, Ulthuan will be impregnable with the elves at their peak!

I'm closely connected to Aenarion, and we know each other inside and out.

Great, the greatest war god of the Old World is on my side. With him here, my safety isn't a problem. A Greater Daemon of Chaos? In front of my Old World Lu Bu, he'd be practically offering his head for sale!

Next, let's formulate a plan to save the world. First, take out Morath...

Heh heh heh, I have no idea how we could lose!

Malekith: "Mother, what are you so happy about?"

?

We're screwed!