After reaching the Mystic stage and getting a power increase from Erebosa, Zion didn't think he would have trouble fighting against the other Divine Apostles, especially after killing one already.
So, when he started fighting Sylveth, his mindset was the exact same. However, there was one thing that changed the playing field. The Ancient relic Sylveth had.
Zion easily eclipsed the wolf in power and could kill him with the swipe of his hand, but the medallion of power was different. It didn't just give the wielder more power, but it also had them adapt to the power of the person they were fighting against, making it a very valuable relic.
Because of this, Sylveth was actually able to put up a challenge against Zion.
"Come on, Zion! Don't tell me that's all you got?!" The wolf punched Zion hard, the shockwave sounding like thunder.
Zion grunted, but didn't waver. He used aura force to pull in Sylveth, punching him back with even more force.