If you really want to know exactly the Cataclysm went down, the Kingpriest trilogy (sadly out of print) is the best source. Basically Paladine gave the Kingpriest every opportunity to back down, gave warning after warning, and only acquiesced to Takhisis’ and Gileans plan (it was the idea of the gods of evil and neutrality, by the way, not Paladine) when there was no other option, as the Kingpriest was literally trying to claim Paladines power. At the same time, Paladine engineered for the Disks of Mishakal to be hidden in Xak Tsaroth where Goldmoon would find them.