“We’re not always bound to him exactly.” He sighed. “We’re—he uses his bones, pieces of them, when we’re made. Part of the outer bone of his right arm was used on me. He calls them phylacteries. It’s what creates our physical immutability. A part of that is used to make the talismans.” He gestured at his chest. “He takes the phylacteries out sometimes and either grows a new bone or takes a spare from some necrothrall. That’s what he did when travelling, so he could leave some of us behind during his trip. He doesn’t like to do it often, but if he travelled without leaving the phylacteries, the
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