Yes. A full Djinn-equip can take a fair amount of Magoi. It cost more energy to use the extreme magics then the equips. That normally can be only done once.

[Though he has equipped both Djinn in one fight before, and managed to use an extreme magic. Easier to use them when necessary and catch someone off guard, then use them all the time. He's also not sure if it's going to cost more to use them at all since arriving here. Theoretically no. Better to play by waste not, want not.

Though he should probably try to equip one to see if it is as exhausting as he thinks it could be.]