The Cataclysm was not a single event as most people believe, but instead a series of wars over 2 decades which would reshape the world. Things done during this conflict reshaped the way magic itself works. The rare magics still lingering from those eras is often much more powerful than anything created since then. Entirely new creatures were created during the conflict just as tools of war.
The current Church in Valencia holds that the people of the Cataclysm were morally corrupt and so the gods destroyed them and changed magic to stop their hubris from corrupting the survivors. However, for quite a long time Valencians called the Cataclysm ‘The Rebirth’ and believed the gods had protected them from the Fate that befell the rest of the world.
The one remaining Elven Realm survived by turning inward and shielding themselves. They hold that they were invaded and hard to turn their forests into traps to hold off their enemies. A few of the Elhedral retain the knowledge of magic from before the Cataclysm, however actual changes to the way magic works keeps them from doing more than maintaining past works of magic.