This is the 279th most frequent Finnish word.
lopussa
At the end.
In this sentence, 'lopussa' is used to indicate that something (the story) has reached its conclusion or the final part.
Tarina on lopussa.
The story is at its end.
Here, 'lopussa' expresses that the event is approaching its finishing stage.
Tilaisuus alkaa olla lopussa.
The event is nearing its end.
In this context, 'lopussa' conveys the state of something (energy) being completely used up or exhausted.