Time skip.
What is time skip?
It's something an author would do in his/her series whenever there's nothing important happening after a certain event or usually when the protagonist going for a long training to improve. The author would go on write something like 'one year later' or 'few years later'. It's because the author is too lazy to explain the protagonist's daily life during a certain arc.
Sometimes, it's coming all of a sudden.
And god, I hate time skip! It's like the author is just going on with the story while sometime skipping some of the important event in the story!
On this book I read in between training, there's a time skip! The protagonist went on a training for five years, and when he and his friends reunited, every one of his friends has changed!
