>>281238480
>Serie's spell sends any curse back to its caster
Yes and was shown to be quite ineffective, especially in a complex situation. Took Serie 100 years to make a spell that could only be used by one person at any one time. Frieren didn't even acknowledge it as being a viable solution, so created her own spell from scratch ( in 1/500 of the time) which could not only completely negate any effect of the curse but reserve it and was able to be shared between multiple people at the same time.