Even though Lucifer had told everyone else to stay alert, he himself lowered his defenses after seeing that the beast wasn't able to break the barrier.
He didn't realize that the beast was much more clever than it looked. It was just pretending that he wasn't able to break the barrier, waiting for an opportunity like this.
Seeing Lucifer stop close to him, his plan was already a success. Not only that, but Lucifer turned his back on him, which pleased him even more.
The black spike impaled Lucifer, coming out from his chest.
As the spike entered the body of Lucifer, he froze in place as if his mind was being attacked.
Alicia took action, slicing the spike of this creature, separating the two.
Yaliza also acted fast as he caught Lucifer and jumped back. He landed ten meters away from the strange creature that was now free.