Bring back monster races/classification & associated stats :
• +X% [damage type] damage to [race]
• -X% [damage type] damage taken from [race]
• and so on ...
Main :
Beastmen, Beasts, Humans, Demons, Undeads, Deities, Arthropods, Magicals, Plants, Fungi, Constructs
Secondary :
Giants, Ghosts
Maybe also with sub class like for Arthropods - Insects, Arachnids, Crustaceans