Kill or Spare Ciara?
Once you’ve defeated Ciara in battle a cutscene will begin, during which she begs Eivor to kill her in order to ensure that the druid tradition cannot be used for evil ever again. You’ll have two dialogue options here:
“An honorable death.”
This option results in Eivor killing Ciara swiftly and honorably, but King Flann will be distraught. In his anger, King Flann will destroy the stone and regret the death of Ciara.
“I can’t kill you.”
Eivor tells Ciara that although she is the key to the terrible druid power, the stone is the source. He asks Ciara to destroy the stone and spares her instead. King Flann has the chance to apologize to Ciara, and they part on slightly better terms.