Chaperone

Chaperone is found in the Path of Luck and Path of Protection.
The ritual is on page 98 of GURPS Spirits which refers to it as an amulet" while page 125 of Hellboy refers to it as a "charm".
Page 152 of Thaumatology uses "amulet".
The 3e books had special text about how it protects against Malediction (ritual) which was left out of 4E's Thaumatology. They refer to a delay of 1d days and nightmares. There is different followup though:
Spirits:
:plagued by nightmares indicating the hostile spiritual forces, barely kept at bay by the amulet. He may seek help in time, if he understands the meaning of the dreams!
Hellboy:
:plagued by nightmares. The charm itself will gradually corrode, wither, cloud up, or otherwise age, until it finally breaks. Chaperone is neither a Guard nor a Screen.
Category:Rituals