Once Travelers have reached the required Adventure Rank and completed the prerequisite quests, you may use a Story Key to unlock Zhongli's story quest, the Historia Antiqua Chapter.
Travelers can obtain Story Keys by completing Daily Commissions. One Story Key will be granted for every eight Daily Commissions completed.
Travelers can check the Historia Antiqua Chapter quest by going to Quests > Story Quests.

〓Quest Start Time〓
Permanently available after 2020-12-01 04:00:00

〓Story Quest Page Unlock Criteria〓
Reach Adventure Rank 26 or above

〓Historia Antiqua Chapter Unlock Criteria〓
Reach Adventure Rank 40 or above and complete all quests in Chapter I: Act III - A New Star Approaches
(Above times are all displayed according to your server time.)
Note: Different servers do not have the same server times. Travelers, please take note of the difference between server times and the time in your own time zone as follows:
America: UTC-5
Europe: UTC+1
Asia: UTC+8
TW, HK, MO: UTC+8

For PlayStation® users, please read this FAQ for more information if you are unsure about the server your account is on.
https://genshin.mihoyo.com/en/news/detail/5314