Oh god I just thought up a weird WMG....
Joubutsu is a madoka-style witch,and her torture chamber is her labyrinth.
Now if this were madoka...
Joubutsu made a pact with Kyubey,and sets to work killing witches,collecting grief seeds,stuff like that.
In the process,she witnesses/experiences terrifying things which gradually broke and scarred her.
As if trying to prevent herself from completely breaking down,Joubutsu tried to shrug all her emotional
scars off and just focus on fighting.
Unfortunately,the grief never came off,and her soul gem continued to darken.Joubutsu's unaware of this,
and failed to cleanse her gem.What happened in the end should be obvious by now.
Joubutsu is a madoka-style witch,and her torture chamber is her labyrinth.
Now if this were madoka...
Joubutsu made a pact with Kyubey,and sets to work killing witches,collecting grief seeds,stuff like that.
In the process,she witnesses/experiences terrifying things which gradually broke and scarred her.
As if trying to prevent herself from completely breaking down,Joubutsu tried to shrug all her emotional
scars off and just focus on fighting.
Unfortunately,the grief never came off,and her soul gem continued to darken.Joubutsu's unaware of this,
and failed to cleanse her gem.What happened in the end should be obvious by now.