It is a stupid decision. It is a stupid prophecy, to begin with. Ignis never once thought this was a good thing, that what had to be done is something that they should just accept and roll with.

...Ignis had tried. Tried to sway Noct from the path that was set for him, the path that he was not allowed to question and destiny he had to accept without a complaint. But he couldn't do it. Their King's mind has decided on the course of action that they don't agree with. But they will have to accept it.

For him.

All the pain, all the rage he felt towards this World, Ignis shoved into his daggers, igniting them to the point of melting.

And as he charges in after them, Ignis hopes with every fiber of his being- mind, and soul, that the new dawn will be worth it. Because right now, he doesn't have the capacity to care about it.