A Seeker is an International Council of Witches member who specializes in seeking and investigating the misuse of magick. If any witch works to do any harm to themselves or to others, a Seeker has a license to take action against them. Witches found guilty are usually stripped of their magick. Stripping usually consist of using a binding spell on the guilty party so they won't be able to use magick anymore.
A Seeker's primary tool is a braigh, a spelled silver chain that is used to bind a witch. It can be very painful to the witch it is used to bind, depending on how corrupt their soul is.
Hunter Niall is a Seeker.