In Elden Ring, players will have to make a few choices to alter the world in the Lands Between. Committing a cardinal sin like burning the Erdtree will be followed with a cutscene, and you'll be back at Lyndell. However, it will be called the Ashen Capital instead of the Royal City.
After reaching Lyndell, Ashen Capital, players will have to make their way towards the Elden Throne. While most of the doors would be blocked by sand, players can take a few paths. Hug the left side of the terrain to reach the stairway shown in the image below, this leads directly to the Elden Sanctuary Site of Grace.
You will meet Sir Gideon the All-Knowing, at the Elden Sanctuary. Defeat him and move up the tree branch that leads towards the Queen's Bedchamber Site of Grace. From here, players can enter the Elden Throne, where they'll fight Hoarah Loux.
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Similarly, if players stick to the right side after reaching Lyndell, Ashen Capital, they'll find the remains of a huge grey dragon. Climb on its wing to discover the ladder shown in the image above. This will lead players inside the castle from where you can visit the Isolated Divine Tower located in the middle of the ocean.
There is also a sewer that players can take after reaching Lyndell, Ashen Capital. This leads down to the Subterranean Shunning-Grounds where players will fight Morg, the Omen. After burning the Erdtree and reaching the capital, these are the paths players can take.
Wondering how to burn the Erdtree? Check out What to do after defeating the Fire Giant at Mountaintops of Giants in Elden Ring? on Pro Game Guides.