Should've just destroyed the whole planet the moment he got out, since it would've been quite a bit easier than making a gigantic golem and controlling it. But what can you do, an idiot MC is an idiot MC.
Welp. She already gave him enough info (witch hive-mind and the possible MUH CHLOE resurrection), so earth-shattering magics would have to be put on hold, unless prison thot was just bullshitting of course.