"Only the Abhorsen can keep the living safe from the dead."
When the Charter was created from Free Magic, the Abhorsen was chosen to venture into death to preserve life. Using the seven bells and the sword, the Abhorsen goes into death to keep the dead down. If you seek Abhorsen, know that it will be a dark and perilous journey. You will have neither bells nor sword, but should bring light to guide your way. Once there, you may sign the Book of the Dead.
Abhorsen used to be a night cache but is now a simple projection. Start at the posted coordinates, then project a waypoint 581 feet at 246 degrees true north. A good reference on this is found here. I recommend that you do the projection on the GPS but walk south then west rather than straight at it: the path will be much easier.