Science: Vampires used to exist in the Autumn Segment. They were almost hunted into extinction by evil researchers since they wanted the secret to immortality ... and good looks. Every vampire has an unexplainable charm.

Magic: Just like the Winter Power Holders are able to use the power of the moon, the Summer users used to be able to use the power of the sun. This was, however, deemed too dangerous for the users, so it was later banned from being taught to anyone and then the skill was forgotten.