Kyran did not object when Cyneah asked to come because he planned to take her along.
On the other hand, Euan wore a complicated expression as he sensed an incoming headache. This was because he could see a very determined look in Cyneah's eyes that spelled trouble to any father who wanted to dote on their daughters.
Cyneah looked like a woman out for blood— err, battle.
Euan could not say for sure whether Kyran noticed her look. And if he did, he wanted to play dumb. However, Euan, for one, wanted the latter to be more aware of what was to come.
Cyneah resembled her biological mother, the late Empress, in this aspect. Once she decided on something, she was determined to see it through to the end.
Kyran had never been to the Kingdom of Cretea. Thus, he gave Euan a transmission scroll so they could get there as soon as possible.