Adam was disappointed with how everything ended, but he hadn't lost anything or suffered much damage, so there wasn't much to complain about.
Everything that was previously in the tower of the Mage Goblin Beast was beyond salvageable and not only had it caused the tower to explode before killing itself, but also made sure to burn all of its belongings in the process.
Despite that, Adam learnt a lot from his battle with the Mage Goblin King and also had a better idea of what to expect in the future if he had to attack an Array Master who was within their own territory.
It also made him more interested in arrays and made him want to learn more about them from his master, but he was sure that his master would leave him some sort of manuals to learn arrays as they could be learnt independently.