In the bottom of the Abyss when you fight all your mirror images they should be tougher.
https://strategywiki.org/wiki/File:U4_SMS_d8_Abyss_L8rooms2.png
Might be easiest to tweak this which determines which maps a characters tile to an index for their hp. Just add if it is those rooms then all monsters map to 255 health.
In the bottom of the Abyss when you fight all your mirror images they should be tougher.
https://strategywiki.org/wiki/File:U4_SMS_d8_Abyss_L8rooms2.png
Might be easiest to tweak this which determines which maps a characters tile to an index for their hp. Just add if it is those rooms then all monsters map to 255 health.