You should never fodder Fjorm in my opinion, unless you already have her at 5*+10. She is in the bonus hero rotation regurarly and having as much merges as possible on her will help your score.
With that said i don't think Atk/def bond is a good choice if you're talking about normal M!Robin, as he won't be able to counterattack melees and TA works better with his native Blarraven tome.
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Fate Grand Order
Dragonball Legends
IV Calc
Heroes