|This article is about the event. You may be looking for the episode.|
A Blue Moon (ブルームーン Burū Mūn ) occurs when two full moons occur in a month, on the second full moon, a night only once in several years. The magic of a blue moon has the power to reveal many secrets.
- The entrance to the Blue Moon Abyss can only be seen on the night of a Blue Moon. The apparition in the abyss has knowledge of all things in the past, present, and future, which it may reveal to those who can appease it.
- The light of the blue moon illuminates an ancient book of the Nine Olde Witches in the Luna Nova Reference Archives about the magic of the Grand Triskellion.
- The light of the blue moon makes Ursula's jug of water in her room into a scrying pool.
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