Legacy of the Dark Sage
When Kyran turned 18, his life turned upside down. The Royal Army raided his clan because his supposedly non-existent magic got exposed. On that fateful night, he was the only one who escaped. Up to the present, the status of his clan was unknown. A magic inheritance that became a curse, Kyran became a fugitive. Always on the run... living in fear when the Royal Army finally captures him. At least that's what most people thought... "I'll definitely save my family. And I will make all those who made my clan suffer pay tenfold. I'll make use of this magic they so feared, and show them what real terror is...." Disclaimer: The cover image isn't mine. I'll replace it when I finished mine.
Revolt
The reason Kyran did not go after Gael when he escaped into his domain, the answer was simple: Kyran could not enter Gael's domain. It was easy for Gael to miss this important fact and only think that Kyran would react to killing intent. However, if Gael had considered Kyran's summons, he would have realized that if Kyran were reacting to killing intent, then he would have been attracted to the amount of killing intent from where his beasts and the army were currently engaged in a fight.
Alas, Gael was unaware that in Kyran's state, he could not distinguish between friend and foe and was purely reacting to any hostility directed at him. One could say that Kyran was like a puppet with only one program: to kill any hostiles around him.