This was a "Su Yu Special Edition" monster that the Skrulls had created, specifically designed to kill Su Yu.
In order to reach their goal, the Skrulls had thoroughly analyzed all of Su Yu's abilities based on their data.
Of course, Su Yu's most outstanding ability was transforming into the Blue Dragon and using wide-range high-damage spells. In addition, he also had the ability to summon monsters (Arcane Puppet, Moon Goddess Illusion, Diamond) and the ability to continuously use Space System skills.
Su Yu's continuous use of the [Flash Skill] can be considered his life-saving measure. Therefore, to kill him, the Skrulls needed to create a monster that could keep up with his continuous teleportation speed.
Compared to the Holy Silver Federation, the Skrulls' own spiritual energy training system was rudimentary and they did not possess spatial arts like the [Flash Skill].