An ellipsis can be used in poetry for a variety of reasons, including:
* To indicate a trailing off of thought or speech.
* To create a sense of mystery or suspense.
* To suggest that the poem is continuing beyond the page.
* To create a pause or a moment of reflection.
It's important to note that an ellipsis is not always used at the end of a poem. It can also be used within the poem to create different effects.