The cataclysmic event associated with the death of a star depends on its mass:

For stars less massive than our Sun (less than 8 solar masses):

* Planetary Nebula: The star sheds its outer layers, creating a beautiful, expanding cloud of gas and dust called a planetary nebula. The remaining core, a white dwarf, slowly cools and fades over billions of years.

For stars with masses between 8 and 25 solar masses:

* Supernova: The star collapses under its own gravity, triggering a massive explosion known as a supernova. This explosion releases an immense amount of energy, briefly outshining entire galaxies. The supernova leaves behind either a neutron star or a black hole.

For stars with masses greater than 25 solar masses:

* Hypernova: These are even more powerful than supernovae and are thought to be caused by the collapse of the star's core into a black hole. They release even more energy and leave behind a very massive black hole.

So, the specific cataclysmic event depends on the star's initial mass, but all involve some form of dramatic and violent change, marking the end of the star's life.