There are three pieces of Divine Calendar to be found.
You need them in the quest The Clock is Ticking, the final New World location Pyramid of Restoration.
Available after quest Meeting Mama Quilla
Available after quest Ixchel's Betrayal
Available after quest World Of Disasters
Once you collect them, place the pieces of Divine Calendar on pedestals in location Pyramid of Restoration.
Then you can continue through the location and reach new Terra region. Click here if you need further help.
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MORE INFO ➡️ Divine Calendar