Demonbite

With the return of the Lifelight, Sturth is farthest from its heat, and the world becomes bitterly cold. Lasting nine months, this season is widely detested. The very air chills you to the bone, and the whole ocean freezes over. On the sea, this season is relatively simple to deal with: those above deck seek shelter below and wait for Stormfall. However, on land, a new threat of this icy season has become clear, something locals call "the biting horde."
For a period of about a month at the zenith of Sturth's orbit, horrid things emerge from the snows, things with too many teeth and eyes. Most people of Respite know this horde by its sound alone, as they are kept at bay by the great wooden walls. However, guards on the walls during this time frequently go mad, raving about teeth and blood.