I want to know the answer to the following question:
What forbid harmful  incantations?
All the background I'm provided with is that "The Twelve Tables forbade any harmful incantation (malum carmen, or 'noisome metrical charm'); this included the "charming of crops from one field to another" (excantatio frugum) and any rite that sought harm or death to others.". Is that enough to answer the question?
Answer: yes