While not overly familiar with Draw Steel as a system, I nonetheless thought this Ancestry was quite fun! The Voidless often taking the shape of a book, and its appearance changing based on the emotional state of the one they're bound to, is a nice narrative touch.
The short writing accompanying this Ancestry to illustrate The Voidless in action was effective as well, giving a much stronger sense of what, precisely, these helpful, balancing beings bring to those who most need them.