During the Event Period which is April 19, 2023 (Wed) after maintenance – May 10, 2023 (Wed) before maintenance,  you can obtain treasure items from more monster zones

Here are the locations for Treasure Items :

If you want to know more about Treasures, check this link out for more details:

https://www.tr.playblackdesert.com/Wiki?wikiNo=205#Treasures

That's it about this guide, if you have any question related to BDO just let me know on my discord: Dustan#0325

Enjoy your time