According to their origin myth, the how did Kiowa enter the world how? The phrase, "No one, not even the rain, has such small hands," illustrates what literary device?
The Kiowas came one by one into the world through a hollow log. It could be an allusion (if no specific subject is mentioned earlier) or hyperbole.
From a Kiowa:
An allusion is a figure of speech whereby the author refers to a subject matter such as a place, event, or literary work by way of a passing reference. It is up to the reader to make a connection to the subject being mentioned.
A hyperbole is a literary device wherein the author uses specific words and phrases that exaggerate and overemphasize the basic crux of the statement in order to produce a grander, more noticeable effect. The purpose of hyperbole is to create a larger-than-life effect and overly stress a specific point. Such sentences usually convey an action or sentiment that is generally not practically/ realistically possible or plausible but helps emphasize an emotion.