Dennis Detwiller’s The Gilchrist Trust would make an interesting antagonist association for WitchCraft, to go beyond its immediate Call of Cthulhu applications. The goal of the Trust, proving the existence of life after death, would bring them directly into contact with the Twilight Order and the House of Thanatos.
Given their self-assigned mission of maintaining the boundaries between life and death, the Order is almost automatically predisposed to act as a foil to Trust investigators’ efforts. “Mundanes,” as most Trust agents would be, aren’t supposed to know about ghosts and the otherworlds. I can see Twilight members actively following Trust agents to muddy their investigations, stealing artifacts under study by the Trust and racing them to newly uncovered locations and materials to remove any traces of necromantic practices.
The Thanatoi’s position on the Gilchrist Trust would be murkier. The House of Thanatos is more about boundary crossers. Their membership is made up of revenants, phantasms, vampires and other sorts who either blur the line, or caper merrily on both sides. So they’ve got the information that can win someone the big prize of the Gilchrist Trust. Whether any Thanatoi would be on board with that information exploding out to the public seems fairly unlikely. The afterlife is their specialty. The thought of it being legitimized and rigorously examined by even a fraction of the scientific establishment of the 1920s should be terrifying.
Of course, this is the 1920s. The occult world of WitchCraft is still reeling from the mini-reckoning of the Great War and the Spanish flu. The Twilight Order and the House of Thanatos are not likely to be entirely on their game at the moment — though maybe the Thanatoi’s rolls have had an influx of revenants and relentless dead from the fields of France; perhaps even Gilchrist’s son, Alexander. Moreover, the prospect of a cool million, or a sizable share of the Gilchrist fortune by taking the big prize, would be awfully tempting to the Gifted necromancer down on his luck. With the self-appointed guardians and experts of the afterlife at an ebb, this could be just the right time for the Gilchrist Trust and its agents to crack the afterlife wide open.