...
...
"I'm not done yet!" Eren roared.
He wrapped his blade in Aura and pressed forward, forcibly pushing the boss back. Then he raised his left hand that was holding a golden magic scroll. It vanished into glowing particles as it got activated, forming a yellow magic circle in his palm. He pointed it at the Reaper and shouted:
"Sacred Chains!"
Golden chains burst forth, shooting straight at the monster. They coiled around its wings and body, binding it tightly. As Eren landed back on the ground, the end of the chain now wrapped around his arm, he pulled it hard—slamming the Reaper into the ground.
–BANG!
The spell "Sacred Chains," unlike what Leon had used against the Thunderclaw, "Sacred Net," focused all its strength on binding a single target—making it far more powerful as it seals the target's ability to use magic or attack.
"I'm getting tired of looking up at you while you're in the air," Eren muttered with clear annoyance.