Inside the royal chamber, Jack sat down. He was very tired considering he hadn't slept since yesterday, but he didn't want to sleep yet. So, he decided to review his improvement and the loot he gained from the war. After he woke up from his long slumber, he hadn't had the time to do that yet.
His classes had all increased in levels after the battle. He spent a lot of time fighting near the capital before he sneaked away to save the hostages, so he received the exp points from the soldiers who fought nearby him. Considering he was the main commander of the Allied forces, he also received exp points gained by soldiers from the other countries, providing they were not too far away from him.
When Azzarilth died, he received exp points despite being unconscious. Even though Azzarilth died by a suicide spell, he and Broidrireg inflicted a majority of the damage. Hence, they were considered the ones who killed her.