An afterclap is a sudden unexpected event or repercussion, or something which occurs after an event is supposed to have ended.
catastrophe
I think it's extinction. ------------------------------- More specifically an "extinction event".
sudden and unexpected or brief to the point of rudeness or steep; precipitous
catastrophe =katastrofeMeaning an event causing great and sudden suffering.
an ice age
The eruption of a very large volcano
Sudden impact.
An epiphany is a moment of sudden realization or insight that leads to a new understanding or perspective on a situation, problem, or idea. It is often described as a moment of clarity or revelation.
an event causing great and often sudden damage or suffering; a disaster
Some event that is usually sudden and unexpected that requires immediate action to rectify.
a sudden event, such as an accident or a natural catastrophe, that causes great damage or loss life.