Here you will learn how to summon Sandgolem and Flashcraft Hydra in Diablo Immortal. You will also learn what Kulle's Hidden Chambers are and how to collect Lost Pages.
The most important event in the Library of Zoltun Kulle are the Hidden Chambers. To get to them, you need to find 5 Lost Pages while exploring the location. This will allow you to open the portal to the aforementioned Hidden Chambers. The pages are glowing gold cards lying on the floor and appear randomly in one of the possible places - individually for each player. These places are marked on the map in the guide with green markers.
The places where you can find the Lost Pages have been marked on the map: Library of Zoltun Kulle - location map.
You end up in a random room after activating the portal (by clicking on the event icon in the mission panel and selecting the button visible in the quest description). Inside the chamber, defeat enemies and destroy objects found there to obtain items and resources. The lowest treasure will be the Enchanted Dust, but you also have a chance to get much more valuable items for your efforts.
An additional optional event is to summon Flashcraft Hydra or Sandgolem after opening the portal. Regardless of which player opens the portal, everyone who fights the monsters will receive rewards. Both of the bosses have a very good chance of dropping Legendary items, so players often inform themselves in the chat about the appearance of bosses.