Final answer:
The phrase 'The first delicate crack of lightning' is a metaphor, as it directly compares the crack of an egg to a lightning strike without using 'like' or 'as'.
Step-by-step explanation:
The expression 'The first delicate crack of lightning' is an example of figurative language used to impart dynamism and power to the otherwise static image of an egg. When deciphering which form of figurative language this is, we must analyze the components: a direct comparison is made without the use of words 'like' or 'as', which makes it not a simile. The comparison does not animate the egg with human-like qualities, so it's not personification. It's not an exaggeration, thus not hyperbole. Therefore, it's best classified as a metaphor, as it directly equates the egg's initial crack to a lightning strike, a powerful and dynamic event.