It didn't take long to get rid of everything on his path. The castle existed on a hill. To get to it, one needed to cross the gate. Having the key is important since the walls were made in a way so no one could climb them. There was also a possibility that the human king would be cunning enough to install some hidden enchantment. Because in Legend of the Past, it was the case. When he thought he was fine in exploding some parts, something unexpected came out, like a chimaera boss or something of the sort. However, this time, it was easy to do everything. He just had to break through everything in front of him.
Soprana did everything with her wand.