Brightest night

(You could be looking for the book of the same name. This article refers to the actual night.)

The Brightest Night occurs when all three moons are full, which happens about every one hundred years. Not much is known about this rare phenomenon.

According to the NightWings, one full moon grants prophecy telling, another gives mind reading, and the third was originally believed to gift animus magic, until it was later proven that animus magic is transferred genetically. Now, it is believed that the third moon enhances the powers of the other two moons.  

Battlewinner and Morrowseer came up with the Dragonet Prophecy in order to find a new home. The dragonets of destiny were born on one the most recent brightest night, prior to the events of the main series. However, as Darkstalker later states, if Starflight had hatched under all three moons, he would have the same powers that Darkstalker did. Sunny, too, might have had those powers, as Darkstalker received powerful mind-reading and foresight from the three full moons despite being half IceWing, which shows that NightWing hybrids can have powers.

History

Darkstalker was born on a brightest night, and Whiteout also was supposed to be - however, newborn Darkstalker prevented this with his powers.

Next Brightest Night

During the events of The Brightest Night, there appears to be a second brightest night, many decades before the next one should have been. This was caused by two full moons and a comet passing very close by the planet. Fatespeaker predicated that the comet would kill everyone in Pyrrhia. This did not happen. Instead, the comet caused minor earthquakes, one of which snapped the moonstone bracelet enchanted to keep Darkstalker in his eternal slumber. So, Fatespeaker was pretty close about the world ending. The next true Brightest Night would be about one hundred years after the one the dragonets hatched on. The specific date for the next brightest night would be around 5,106 AS.

Trivia

• It is mentioned several times throughout the series that Clearsight may have thought of the brightest night as a curse, because of the powerful NightWings that could hatch from it like Darkstalker.
• There is probably a Darkest Night, where all of the moons are new. This has never been mentioned, and probably has no major significance.
•  Any NightWing born on a Brightest Night will have enhanced mind reading and future seeing powers.
  • Starflight is the only known NightWing to hatch on the brightest night and not have any powers. This is likely because he hatched underground, away from the moonlight, as the guardians of the dragonets were unaware that it would gift him powers.