As part of the "A Fated Encounter" questline, which features the crossover between Assassin's Creed Valhalla and Assassin's Creed Odyssey, the "Night and Day" quest requires them to meet with Kassandra and follow her to one of the Isle of Skye mysteries.
Players must need to solve said mystery, which is in a form of a puzzle, in order to accomplish the said quest, and progress in "A Fated Encounter."
Clearing the 'Night and Day'
Before taking the said quest, according to IGN, they need to meet first Kassandra, who is at Tobhta, a small fishing town near the middle of the Isle of Skye, about 400 meters west of the old man of Storr Highpoint.
He will find her at the town's stables, which is on the northern part of Tobhta. Once they seen her, they will speak to him, then they will mount a horse before following her along the road as she leads them towards the next area, which is the Fairy Glen.
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Once they arrive in the said area, according to Gosunoob, Kassandra will tell them about the "riddle" that were in the stone formation, and it is up for them to solve it.
After the said conversation, they will approach one of the rock formations, which is the one overlooking the standing stones, then they will interact to it in order to read its inscription. It will show them the shape that they need to create.
Once they got the shape, according to the PC Gamer, they will need to use their Odin Sight on the said rocks until they will see glowing green markings on them. This will give them a clue, as well as a guide, to what stones will match the other in order to create the given shape.
Next, they will go to a makeshift shelter that is on the far side of the stones, which is opposite the rock with the engraved shape. From there, they will notice that there is a tall moveable crate that is surrounded by smaller boxes.
They will approach the said crate and break its surrounding boxes with their weapons. Then, they will drag the said crate in an "L" shape to an unbreakable box at the end. Then, they will pull themselves up onto the create, then they will look at the stones.
They should set their sites on the cluster in the middle, then they will move a little to line themselves up in order to see the shape. From there, a cutscene will be played, then they will speak to Kassandra again.
Afterwards, they will be following her towards the Cave of Gold. Then, they will head down to the shore and into the said cave. From there, they will stand in the center of the circle that displayed on the floor. While standing, they will wait for Kassandra as she is analyzing the cave's walls.
As she is looking to the said walls, a small group of bandits will ambush them. Once they defeated them, it will trigger another cutscene, telling them that the mission is complete.
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