I think on:
To add more:
Sources:
Other threads with interesting discussions:
I leave here links to fansites that actually focus on mysteries about tibia:
In my opinion, there aren't unsolved quests. They are simply added without taking into account the purpose, for the curiosity of the game's history and are never intended to be completed. example banuta +999 and spike sword quest.
Mysterious ornate chest - this quest is discovered all the time, and there is no end :P
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