Gradus ad Capitolium is the fourth quest in the Canticles of Harmony World Quest series in Genshin Impact. You can automatically start it after completing The Last Day of Remuria. Gradus ad Capitolium also has two mini-quests where you must solve two flying bird phantasm puzzles to reconnect the waterways leading to Domus Aurea. You can also unlock a hidden achievement while playing the quest and be rewarded with another 40 Primogems for completing the quest.
Here's a simple guide on how to complete the Gradus ad Capitolium World Quest in Genshin Impact.
The first objective after completing The Last Day of Remuria World Quest is to head to Domus Aurea. Furthermore, you will unlock a new in-game mechanism that lets you summon special currents when you're close to Scylla.
Use this feature to fast-travel and head to Domus Aurea, which will also give you an achievement titled "Vishap Corps Scylla," worth five Primogems in Genshin Impact.
Once you reach the quest location using the special currents, a cutscene will begin and you will end up engaging in a short battle against three Praetorian Golems. Note that you can only use the main character in this fight. However, you don't have to worry since you only need to reduce their HP to a certain mark.
Follow Scylla to the next quest location and solve the mural puzzle by returning the flying bird phantasms to their rightful places. Start by operating the projection mechanism near the stage and adjusting the camera angle by hitting the left button thrice and the down button twice so that the horn matches the corresponding image on the mural.
Once that is done, approach the bird phantasms that are flying around and make their return to their places. This will spawn an Exquisite Chest,
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