The Last Day of Remuria is the "Second Movement" in the Canticles of Harmony World Quest series in Genshin Impact, and it can be automatically triggered after completing Underwater Nocturne. During the quest, you will get a task to break the chains that bind Scylla and free her from the seal. It is also an essential quest since it unlocks the complete map of the Sea of Bygone Eras.
Completing it will also reward you with 30 Primogems and other in-game items. Here's a simple guide on how to break the chains that bind Scylla and complete The Lasy Day of Remuria World Quest in Genshin Impact.
After completing the Underwater Nocturne quest in Genshin Impact, enter the portal behind Monsieur Os and head to the Sea of Bygone Eras. This will also unlock the new map and give you a new achievement called Sumphonia Sine Fine, worth five Primogems.
Break all three chains that bind Scylla to complete this objective; start with the one in Hortus Euergestis. Follow the light connecting to the whale in Initium Inai to get to the shackle's location. You will find a few octopus swimming around Resonant Anemones that look like flowers.
Use the power of the music box to stop the octopus in suitable locations such that all the flowers are inside its aura to make them glow. Do this with all the flowers around the shackle. Once that is done, you will enter the dreamscape for a brief moment, triggering a cutscene of dialogues.
Lastly, swim toward the top of the shackle and hold the power of the music box to break the chain. This will also spawn a Precious Chest, worth 10 Primogems in Genshin Impact.
For the second chain, head toward the small cave southwest of Initium Iani. You will find three Praetorian Golems on standby. Defeat all of them and use
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