Ciri the Empress is the best ending. The best written, we can meet Yen/Triss, Zoltan, Dandelion, a white orchard in winter, a lot of conversations and the most emotional and, like books, has a sweet bitter ending. Ciri herself chooses what she wants to do and can quit at any time, which she will probably do. And if not then she can be like her
There are two prerequisites for the Empress ending. Taking her to see Emhyr is one, Nilfgaard winning the war is another (meaning, you have to do the Radovid assassination quest line and side with Roche against Dijkstra). If either of the two prerequisites is not met the game defaults to the Witcheress ending. Obviously Ciri surviving her fight
The main quest with Cirilla has the greatest impact on the ending. During the game, by picking various dialogue options - not always consciously - you decide of her fate. Three endings are available: Ciri dies, Ciri lives - and becomes a witcher or Ciri lives and becomes an empress.
The ending where Ciri dies, the ending where she becomes empress of Nilfgaard, and the ending where she becomes a witcher. In general, the fanbase considers the witcher ending to be the best ending, with the empress ending also being a good and valid option. The ending where Ciri dies is considered the 'bad' ending.
If you made 3/5 positive choices and took Ciri to see her father, the empress ending is locked in. The only way to get the witcher ending after the empress ending is locked in is for Nilfgaard to lose the war (in which case she can't become empress as Nilfgaard collapses). The bad ending just requires 3/5 bad choices.
The crones quest doesn't affect Ciris ending. To get it you have to make her be confident in herself and make amends with her father. Thanks a lot guys. Spoiler: They dont effect ciri ending. Ciri comes empress by a few ways but one of them is if you take her to see her father at a later date. As for the Crones.
However, it is likely that Ciri becoming a Witcher is considered the canon ending. CD Projekt Red has announced The Witcher 4, and a new trilogy is in the works. It is unclear what the story or who the main character will be for this new trilogy; however, the promo image shows a Cat Witcher medallion. Ciri wears a Cat Medallion in The Witcher 3
There are two endings in which Nilfgaard wins the war with the North. In the first ending, Ciri becomes a witcher instead of the Empress of Nilfgaard. In this "good" ending, Radovid is assassinated. Redania's cruel conquest of mages and non-humans ends. Temeria is granted some form of sovereignty as a Nilfgaardian vassal state.
Emhyr var Emreis automatically maintains his status as Nilfgaard ruler if Ciri doesn't become Empress. And in this position, he's capable of beating Redania in the war and ruling the entire continent. This is how to accomplish that: Complete Triss's questline to get the mages out of Novigrad. Kill Radovid by completing Reason Of State.
When Emhyr presented Ciri with her only choice of becoming Empress and never seeing Geralt and Yennefer alive again, she was about to break. Perhaps it was fatherly instinct, perhaps it was a calculated need not to have her will broken, but it was at that moment that Emhyr's plans changed and he personally revealed to Ciri that he was her father.
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