Clerical Investment is a social, mundane advantage, described in Basic Set, p. 43, and referenced in GURPS Banestorm™, p. 183, on its not being necessary for monks; in GURPS Dungeon Fantasy 2: Dungeons™, p. 3, on buying holy water, and p. 15, on seeking divine aid; GURPS Fantasy™, p. 148, on seeking divine aid, and p. 149, on sanctifying a location; in GURPS Low-Tech Companion 1: Philosophers and Kings™, p. 5, on tribal shamans; and in GURPS Magic™, p. 199, on clerical spellcasters.