Question

which technique is illustrated by the ending of the story when the colomber reveals its true intent in following stefano

Answer 1

The answer is Irony.

Answer 2

Before the ending, the element of horror was seen in the story. The ending shows that the colomber does not want to harm Stefano. In the end, Stefano feels regret for the way he lived his life. This is a type of situational irony.