31 Grima has serious bond villain stupidity issues.
Like, he Spoiler:uh, this is just in case you opened this by accident, awakening spoilers ahead.
Spoiler:Remember how the green gemstone was fake? The specific gemstone that was used on the chapter with validar. Grima!Robin used that to resurrect himself, yet due to it having a fake gemstone in it, that basically means he didn't even need the fire emblem in the first place. He could have just destroyed the fire emblem. Or killed the party when they were on their way to the shrine. Or just DO SOMETHING INSTEAD OF JUST MENACINGLY FLYING AROUND