@Siikalahna He can beat the dragon, but so can his friends. Remember King Erik is the Hero and Golan is the Warrior. Erik was able to block the corrosive breath without any problem. The point of a team is for everyone to do their part. So Erik will take care of the dragon. Golan will take care of Super Thot. Luck will take care of the Lord.
Honestly the best person to take on a Zombie Dragon would be Queen Levi since she has Holy power, but she isn't there, so her husband will just have to take care of it. The only one who isn't needed is Shia, but she is the representative for the Beastfolk and this is a mission for the Beastfolk, so her being present makes sense even if she's mostly useless.