the winter is coming

It would be a minecraft event that would happen rarely, but when this happens all the biomes (except the desert) are covered with snow, the seas freeze with a special ice block for the seas that when winter ends this block of ice disappears of the seas little by little, but while it is winter the harvests would take longer, mobs like cows, chickens, rabbits and pigs spawn rarely, causing the player to prepare for winter and accumulate food, but not Only that, but there is also a winter air that causes frost damage if you are not near a bonfire and thus give more utilities to the bonfires.

And as a bonus, there is an event before winter that tells us that winter is coming.