The sarcophagus.
Sitting in the center of the room in the lotus position, his eyes closed, Isaac was breathing calmly, trying to set up his thoughts so as not to be overwhelmed by the harsh reality of events.
'Let's summarize the situation as a whole. I no longer have the power to leave this place because the magic circle disappeared when I was unconscious.' He thinks, noting this first point.
And, after some breath, he opened his eyes, exposing his black pupils, and reached out.
Suddenly, even before he chanted any incantation, black flames lit up and danced in his palm.
He reaches out his other hand, and chants in a low voice. "Water ball."
~~~
Seeing that nothing was occurring, he nods with a platitude.
"I can use some of my skills, but not all. As for the cause of this, it's because of that." He looks at his list of skills through his system.
[Skills list.]