Rex managed to reach Iris in time.
He could sense the wickedness inside of Stelios and was ready to protect Iris.
Observing Stelios attentively, Rex could gauge his strength and abilities and prepared a counter to deal with him. Casting the King of Kings skill as well as the Latch of Chains skill simultaneously, he easily suppressed Stelios' abilities.
Choosing the Latch of Chains skill was the right thing to do.
It would be way harder to fight someone like Stelios without such a locking skill.
Despite not being able to tap into Nivellen's power properly, he could still deal with this kind of enemy.
Boom!
Managing to strike a savage uppercut, empowered by the Brutal Impulse ability, Rex knocked Stelios off the ground and even broke some of the bones in his wings. Not stopping at that— keeping a merciless flow of attack, he leaped and charged his claws with all kingly energies.