Mercy
Mercy asked Jennifer A. Nielsen:

This question contains spoilers… (view spoiler)

Jennifer A. Nielsen Hi Rosaline - That’s an interesting question. I have long promised readers that if Sage’s voice ever reappeared in my head, I would listen. For all this time, he’s been good just as things were. Then one day, his voice was simply there, telling me he was bored and getting restless. I think what prompted it was the accumulation of reader fan mail, asking to know more of what happens in his life.

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