While exploring the vast world of Teyvat, players often overlook various hidden quests, chests, and achievements. The Fontaine region, nestled between the Liffey region and Fontaine's research institute, is brimming with secrets and puzzles, including the elusive cipher letters that unlock the hidden achievement titled "The Calendar of the Future Is Longer Than the Diary of the Past."

To uncover these cipher letters, players must venture between the Liffey region and Fontaine's research institute and utilize an energy transfer terminal to reveal their hidden messages. Here's a comprehensive guide to help players locate all six cipher letters scattered across the Fontaine region.

Cipher Letter #1 - Material Office Ruins:Located within the confines of the materials office ruins, players can stumble upon the first cipher letter as they explore this area.To complete the Fontaine Research Institute Chronicles world quest, follow these steps:

• Use the energy transfer terminal on the second floor to decipher the cipher symbol on the first floor.

For the cipher letter #2 located in the Academy Assembly Hall:- Teleport to the north waypoint near the experimental field generator.- Head to the lower floors and use an ousia block to activate the energy transfer terminal.- Pan the viewfinder to your left and scan the cipher letter.

For the cipher letter #3 found in the Experimental Field Generator boss area:- Teleport back to the same waypoint and head south to the Assembly Hall Ruins.- Climb to the upper floors to find the energy transfer terminal and scan the cipher symbol.

To find the cipher letter #4 in the Central Laboratory Ruins:- Teleport north of Central Laboratory Ruins and glide southeast towards a ruined building.- Find the stairs leading to the basement and unlock the energy transfer device using an ousia block.- Transfer energy from the blue storage block to the red block to scan the cipher letter.

Finally, for the cipher letter #5 located in the Executive Office Ruins, complete the quest to access it.Teleport to the north waypoint of the experimental field generator and make your way west to the executive office ruins.

Activate the terminal by striking the energy storage block with an ousia block.

Defeat the clockwork meks and scan the cipher letter located in the Liffey region.

Teleport to the Statue of Seven in the region and utilize the nearby stairs.

Activate the terminal and scan the sixth cipher letter to progress towards "The Calendar of the Future Is Longer Than the Diary of the Past" achievement.

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