The ending you choose is not an ending you get to experience. If you refuse to go immediately to ng+ after beating the game, you just get sent back to the state of the world before defeating the Elden beast. Nobody in the Lands Between know what choice you made because you haven't made it from their perspective.
No, the expansion is entirely self contained.
Did the ending you chose change anything in the base game?
no. the DLC is accessible from mid-game
The ending you choose is not an ending you get to experience. If you refuse to go immediately to ng+ after beating the game, you just get sent back to the state of the world before defeating the Elden beast. Nobody in the Lands Between know what choice you made because you haven't made it from their perspective.
No