I am the GM for a set of players who can be considered to hold graduate degrees in Rules Lawyering and Rules-As-Written Studies. Their PCs are Chaotic Greedy I mean Chaotic Good.
I would like to give them opponents who are an evil cult. These enemy NPC Clerics are well organized and well funded. The clerics have magic gear, but they don't want their most valuable top end gear used against them. I have not decided on the cleric domains: Evil, Destruction, Magic and more are all options here.
As a GM, I want to slow down my PCs from acquiring stacks and stacks of magic gear. I understand "wealth by level" and my players have no complaints to date.
I see Break Enchantment and Bestow Curse and Remove Curse on the Cleric spell list. I'm thinking that these NPC Clerics could come up with something that has the effect of "When a Member of the Cult uses this magic item, it works normally. When a PC tries to use it, it does not work normally." Perhaps the bonus disappears. Perhaps a curse activates. I am not sure how to build this RAW for my Pathfinder 1e game. I kind of like the idea that NPC Clerics use their own cursed gear without penalty.
I am aware of how Intelligent Items can be given a purpose which can lead to Ego battles. This is a rare thing that I would pull out once or twice. I'm looking for something else I could use more frequently.
I am aware of duration limited effects, like how Magic Weapon, Greater only lasts for a certain period of time. This is what I was thinking of using liberally.
Is there other precedent, either in the existing rules or a Pathfinder module or somewhere else, for a spellcaster to create a weapon that functions normally when held by a True Believer, but functions as cursed for someone who is not part of the cult?
EDIT based on comments: My larger goal here is to give the PCs an enemy force with enough resources to challenge the PCs but not so many resources winding up in the PCs hands that the PCs blow by the Wealth By Level guidelines. I am thinking ahead to when the PCs reach levels 11 to 15.
I am aware of how Fire Trap and Explosive Runes allow a wizard to do what I'm getting at, with duration Permanent Until Discharged. Mark an item in such a way that the wizard can use it, but if an enemy rogue steals the item, it explodes. Yes, I could house-rule an equivalent special spell for clerics in this cult. I am wondering if there's already a precedent in some bonus book for Clerics doing something similar with curses. I thought that would be thematic for a cult of evil clerics.
From the 3.5 answer "A new magic item can be created so that its power is reduced if it's in the wrong creature's possession." This is one option to pursue. I will look at this more closely, thanks.
WRT "What kinds of permanent items are you expecting the PCs to keep?" As a GM, I want the clerics to pose a threat to the PCs. One way to do that is to give several clerics a +3 mace each. Then the PCs wind up with a several +3 maces. Another option is to give several clerics a Masterwork mace and at least one of the clerics is on Magic Weapon, Greater duty for the day with the Extend Spell feat, draining slots. I was thinking there might be a third option already existing which I have not heard of.
I agree, "PCs sell the stuff they take from enemies to buy the stuff they actually want" is what will happen. As GM I have multiple ways to challenge the PCs. Maybe instead of giving the evil clerics More Stuff with strings attached, I just supply the evil clerics with more summoned demons that don't have Stuff and manage Wealth By Level that way.