I have a tool that answers this question: the Advanced Damage Calculator. As I recall, Yamata no Orochi is a net damage boost starting with -40% DEF. You'll have to re-analyze for an effect starting at turn X and extending to turn Y though.
I have a tool that answers this question: the Advanced Damage Calculator. As I recall, Yamata no Orochi is a net damage boost starting with -40% DEF. You'll have to re-analyze for an effect starting at turn X and extending to turn Y though.
Magicami Starter Guide: Rerolling for Success
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Sanahtlig's Kamihime Project Toolbox: Includes damage calculators and other useful tools, data, and info I've designed and collected. Make a copy to edit.