The Breaker's description is a little ambiguous, it seems to suggest that the blood is drawn from the wearer's hand, not the target.
(in which case putting poison on the needles would be a suicidal thing to do)
The wielder takes no damage if he has natural DR and a specified amount if he does not.
How does the blood get drawn if the needles do not penetrate 1 pt DR?
The entire thing *could* be solved by simply saying that the needles penetrate the target (and still provide the skill bonus) rather than the wielder, and that the target takes the damage and it is his blood left as a handprint.
Perhaps a touch attack could be made to use this in combat.
There are other things I have some issues with (related to other equipment), but I'll leave it here for now
All in all, the book seems very well done, just some things that could be better explained or refined.