For what it's worth, I stand by my theory that the greenmetal arm is going to become her new wing... Only now it'll have to be both wings.

If the thing can stretch itself out and grow by absorbing goblin blood, I see no reason it can't grow large enough for two wings.

Also, where is this "The orb only works once" theory coming from? Was there anything hinting that in-story or is it just a crazy theory?