Base on the question where as asking to complete the passage and base on my research and further investigation, One of the way to develop a main idea for the advertisement is to conduct product research. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification
Answer:
Xander offered to hide cassia's artefact
Talk about where it originated from and how (if it did) helped older civilizations. I really don’t know anything about pomegranate seeds but think like you’re writing this about a person and start with the birth of the pomegranate seed.