This is an annual event that happens every year which started in 2018 where all daily rewards are doubled! I pasted from the news-
All Tibians will receive twice as many items from the reward shrine during that time. The daily reward XP boost will last twice as long as well!
A good tip will be to always check the news and also the Event Schedule here: https://www.tibia.com/news/?subtopic=eventcalendar
Or go to the official Tibia website at Tibia.com and then go to News -> Event Schedule and you'll also be at that link. If you hover over a particular event it'll tell you what the event is about as well. You can also view the calendar on the login screen of your Tibia client. Typically this event will also be shown in the News.
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