I never got this sidequest and I'm worried that it might effect the outcome of the game it says on this site I need to complete 4 side quest and I did all other 3 quests. Does it matter that I didn't do Reason of State. Can I still get the ciri lives and becomes a witcher outcome? Thanks
You can find info about all the endings on this page : Witcher 3 Endings
To get the witcher ending, Reason of State isn't necessary. Il it only required for the Empress ending.