Scarlet Night

A Scarlet Night (緋の夜, Hi no Yoru) is a natural phenomena that takes place multiple times, mostly at any year depending when the Moon is in a full but certain position. The Opening of the Advent had take place on a Scarlet Night, ultimately setting the series plot in motion. It is the enrichment of the aura within the people who carry the Daemonblight and turns them into Daemon. The event is signified by a bloody-crimson full-moon which usually turns humans and other beings into wolves and many other forms of daemons. It was originally said to have occurred after a three-year time period. The strength of the daemon initially depends on the amount of malevolence, the darkness of heart, which one has. The daemonblight enhances malevolence which is then unleashed in various forms during this night.

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 * —About the Scarlet Night.

Background
When a Scarlet Night occurs, the moon becomes full and turns a crimson red, recoloring the sky and even the ground and all other surroundings with its presence. As Eleanor Hume explains it, legend holds that the crimson moon is a "gate to the beyond, and is proof of humanity's sins". Eizen elaborates that a Scarlet Night occurs whenever a full moon reaches a certain position, causing the land and the moon to pull at each other, earthpulse energy spilling into the sky and turning it red. Such power has the potential to produce enough mana to affect even that of a Sacred Empyrean Beast, making it an ideal time to conduct a ritual such as the Opening of the Advent. Due to humanity's sins, the earthpulse is stained with the blood of humans throughout history, which is in turn emptied into the sky, making the Scarlet Night a symbol of human sin. Humans are far more likely to fall prey to malevolence during a Scarlet Night, resulting them becoming daemons.

Notes & Trivia

 * After Velvet Crowe wakes up Sorey and Ruby Rose, the Scarlet Night is in full swing. Alisha Diphda and the others bury Lunarre, then depart for Mount Killaraus.