Didn't he just give Eyra a shadow clone to help her fight with? So where is it? Of course something like that is introduced and then never shown in action. If the spell has worn off, why hasn't she returned to him? There's this puzzling disconnect between what they say and what we see depicted.
They actually showed where Melphina was keeping her talismans (her chest armor apparently also serves as her pockets), usually things like this are left as "hammerspace items" and never addressed. Fanservice I guess.
This is getting rushed as hell but that's because we know there are only 4 chapters left until (the axe falls) and this ends.