cataclysmic (adjective)

1. The cataclysmic flood described in the Bible, known as the Great Deluge, is seen as a punishment from God for humanity's wickedness.

2. In the climactic final battle, the cataclysmic explosion caused by the protagonist's powerful attack destroys the entire city.

3. The cataclysmic battle between the dragons and the ancient wizards resulted in the complete devastation of the enchanted forest.

4. The cataclysmic breakup of their relationship left both of them heartbroken and shattered.