The best way to detect what mod alters the .cre file is --change-log'ging the .cre file... as said in the pinned topic. After which there was no wondering which mod causes what...
thanks for the tip! I checked with wraith01.cre and found out BPv180/BACKUP/0/WRAITH01.CRE has no protection from magical weapons spell in its memorization slot and the one below it does...
which means BPv180 changed it and I'm going to play BP so I guess it means I'd gear up my party a bit better