GURPSよろず

A worshipper may want to make a request of a god or other supernatural being. In a world where gods exist, they may answer such requests. If the worshipper has a special relationship with the god, represented by an advantage such as Contact or Patron, follow the rules for the advantage to determine the result. If not, treat it as an NPC reaction.
Most worshippers’ appeals are either requests for aid or requests for information.
What level of success is required depends on how active the god is. In a world where miracles are rare, only an Excellent reaction will bring aid or information. In a world where they’re common, a Very Good reaction is sufficient. A Good reaction is sufficient only in a world where gods and mortals interact all the time. However, where common divine favors are, divine punishments are equally common.

Reaction roll modifiers may apply:
　+1 if from a worshipper with Clerical Investment
　+2 if from the highest ranked priest in an organized group of worshippers (not cumulative with above)
　+3 if from a worshipper with True Faith (not cumulative with above two)
　+1 if in contact with a holy relic
　-3 if on cursed ground (unless it is cursed because of pollution and the prayer is for vengeance on the polluters!)
　-2 if on unconsecrated ground (sanctity Normal or lower; see p. 101)
　-1 if made in a temporarily consecrated site (see page 149)

It’s not a good idea for mortals to attempt influence rolls against gods; gods usually have much stronger Will and are often Indomitable.
Similar methods work for negotiation with spirits or with demons.
With demons, the usual situation is either a commercial transaction or potential combat. A much wider variety of transactions is possible with spirits. Tests of loyalty are not appropriate for gods, who don’t become servants, or for demons, who never give more than an outward imitation of loyalty. For other spirits, they may be suitable.