Product code: Necromancer's Pendulum, store Snake & Toad Bone
Beginning with the pendulum's vial, it contains: the fabled "toad stone" preparation mentioned in works such as Mercer's, The Wicked Shall Decay & Hueffer's, Book of Witches among other classical grimoires. Added to this is Dittany of Crete and Dragonsblood resin, two well-established herbs of wraith summoning via the ancient Greek Papyri. Combined, these properties should ensure the cooperation of all but the most cantankerous specter.
The snake spine leads to an store obsidian urn pendulum head which can hold any selection of: herbs, oils, or sigils you choose. I will include a vial of "bridgewater" (water collected at Samhain sunset from underneath a bridge that both living and dead must pass.)