The first batch of winterberries is finally ripe. Now it is time to produce some delicious berry juice during the Annual Autumn Vintage, which takes place from October 01-08, and again from October 17-24! Just make sure to take off your shoes and wash your feet before you start the treading!
During the event, winterberries can be looted from various monsters. Collect some of those berries and talk to the trusted member of the Combined Magical Winterberry Society. You will be sent to a secret location, where you can start your treading once enough winterberries have been delivered.
If you need further information about the treading process, just ask Gruffy.
Your world will succeed if enough loads of winterberries are processed in time to temporarily refine all health and mana potions of your world. Their effect will be enhanced by 33% for 7 days in case of success.