Q: If Caster and Ciel went full out on magic and fought each other, who would win?

A: That'd be Caster. A lot's been said, but see, she's a witch from the divine era, something that shouldn't be in the present. If it was a competition against human opponents, then Caster would present the most horrifying and greatest results among the HF 5 Servants..... Though, if Ciel got her hands on what lies within the deepest parts of the Evocationary area of the Association and sends the Seventh Scripture in her, things will be different.

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