system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer Fantasty Battle] Wtf happened? I somehow missed the universe ending?

[OOC: I haven't played or really kept up with the lore since 2006, it looks like they've done a soft-reboot or something? I don't even know how to properly phrase this question in-universe. If I could get a run down of that and the new lore it would be great! I wouldn't mind it coming from the pov of an in-universe scholar or something.]
gpt
Cliffs notes... 

Teclis unwound the Vortex and unleashed the full force of the Winds of Magic, so he could bind them to mortals and create new gods capable of defeating the Chaos Gods. 

It sorta worked, creating 8 immensely powerful Incarnates, but is also unleashed the full force of Chaos. Unfortunately, because Morathi interfered, Teclis lost control of many of the Winds, and was unable to elevate his chosen champions. 

There was a final confrontation at Middenhiem between Teclis and his Incarnates, and the forces of Chaos, and things basically went tits up, and the world was consumed by chaos.

The Incarnates managed to save some of their own, however, and created 8 new worlds modelled after the Winds of Magic. Over centuries, the new factions polarised into 4 primary alliances; Order, Chaos, Destruction and Death, led by Sigmar, The Chaos Gods, Grimgor and Nagash respectively. 

There's a good deal more to it, but that's the synopsis of the conflict... Lots of characters died, some new ones cropped up, the Horned Rat became a 5th Chaos God... And now we have 8 Magic-Themed worlds ruled over by immensely powerful Demi-Gods of former characters.