Shadows over Innistrad
The Moon of Silver and Innistrad's Seasons
Innistrad's moon is both a source of hope and a harbinger of woe. Many Innistrad astronomers believe that the moon is a vast desert made of grains of pure silver, and that any extant silver on Innistrad originated from the moon. Cathars and priests know the power of specially blessed silver to harm werewolves and ward off other horrors, so the moon has become associated with the divine strength of the archangel Avacyn. Some even perceive the shape of a heron in the areas of dark and light on Innistrad's moon, and so the heron has come to be a symbol of Avacyn. But the rise of the moon can also dampen protective magic and cause werewolves to transform from human to wolf. The fickle silver moon seems both to serve humanity and to bring out the worst evils within.
Innistrad humans also name the world's seasons by different aspects of the moon, as it seems hold a strange influence on the world as the seasons change.
This is Innistrad's autumn. A huge orange-to-blood-red moon hangs in the night sky. The days grow shorter. The weather cools with each passing day and the forests turn vibrant colors. This is considered to be the time when vampires are the strongest. Bonfires are common during harvest time, when farmers toil late in the fields until after twilight. The bonfires are thought to keep the vampires away.
This is Innistrad's winter. The chill never leaves the air and the sun's apex is close to the horizon. This is the longest season, and the time when food becomes most scarce. More hunters have to venture out into the wilds in search of food, which results in increased attacks on humans. This is considered to be the time when werewolves are the strongest. Since there are more humans hunting and traveling in the woods during these months, werewolf attacks are more prevalent. The humans believe the attacks have something to do with the season itself, although there are no more werewolves at this time than any other time of year.
This is as close as Innistrad gets to a spring and is the shortest season. The days are longest and the sun is the brightest, though still pale compared to some worlds, and there is new growth in the forests. Humans consider this their season, associating it with new life and birth. Babies born under the New Moon are considered to be holier, with a better chance of attaining the Blessed Sleep.