Though it was clear it would take some time before the young ruler could step entirely out of her father and brother's shadow, the greater part of the islanders were pleased and proud with their choice of ruler. All these feats convinced the Skelligers that Cerys was fit to be queen.
If Geralt sides with Cerys in King's Gambit: Once again Sparrowhawk gave proof of her cunning, this time by unmasking Birna's plot and cleansing the shame from her clan's name after the infamous "bloody banquet" at Kaer Trolde. If Geralt helps Cerys in Possession: Cerys did what she set out to do - with the witcher's help she freed clan Brokvar's leader from the wraith that had tormented him for years.
That is why she had sailed to Spikeroog to free Jarl Udalryk from the strange affliction that seemed to curse him. Striving as always to outdo her brother, she intended to perform a great deed that would earn her widespread recognition and respect. Though Cerys' decision to stake a claim to Skellige's throne came as a shock to everyone else, she had thought it over quite thoroughly beforehand. Dauntlessly she sought to prove at every turn that there was no task she could not fulfill as well as - or better than - any man in the islands, including her older brother Hjalmar. Cerys was an islander through and through and the spitting image of her father, having inherited all his courage, resolve and stubbornness. Known as Sparrowhawk to her friends, she was as fierce and swift as this name would indicate. Journal Entry While in Skellige Geralt finally had the chance to meet Cerys an Craite, the younger of Crach's two children. If Cerys does indeed become queen, Geralt can approach her to ask for assistance in the upcoming battle at Kaer Morhen while she does not go herself, she sends Hjalmar to help. Under her rule, Skellige prospers and becomes a much more peaceful place. For her actions, Cerys is subsequently chosen to be the queen of Skellige. If Geralt decides to help her, she adopts a methodical approach and ultimately succeeds in uncovering the culprit: Birna Bran. Later on, she is present at the ill-fated feast at Kaer Trolde.
Thanks to Geralt's assistance, her endeavour is successful and the Hym is expelled from Udalryk, ending his afflictions. In the quest Possession, Cerys sails to Spikeroog to free Jarl Udalryk from a curse. In The Witcher 3: Wild Hunt, Geralt can help either Hjalmar or Cerys to become the new ruler of Skellige during a secondary quest.