Generally you don't want to over use foils and make abilities useless. Between mechanical traps, lead lining and [Tooltip Not Found] you could easily have detect magic literally never work which will be annoying for people using it. There's nothing worse than being cautious and taking steps to look for traps just for the dm to deem you auto fail at detecting them due to some unenforceable foil they've put in the way like a direct counter they made knowing your abilities.
My advice would be leave it to rolls and use it sparingly. Treat use of detect magic as actively looking for traps so they roll a check as well as using detect magic. If the spell would reveal the trap normally they auto succeed, if it wouldn't because it's obscured by lead or non magical then its a normal check to look for the traps. As for when to use it, make sure there are times when player abilities do work so do not just blanket cover everything in a dungeon in lead and keep it for villains who have something more than just the general " people in this world would know" kind of excuse. They should more than know they should be particularly invested in doing , it should say something that they went to this effort such as they were expecting spell casting adventurers or something.
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Generally you don't want to over use foils and make abilities useless. Between mechanical traps, lead lining and [Tooltip Not Found] you could easily have detect magic literally never work which will be annoying for people using it. There's nothing worse than being cautious and taking steps to look for traps just for the dm to deem you auto fail at detecting them due to some unenforceable foil they've put in the way like a direct counter they made knowing your abilities.
My advice would be leave it to rolls and use it sparingly. Treat use of detect magic as actively looking for traps so they roll a check as well as using detect magic. If the spell would reveal the trap normally they auto succeed, if it wouldn't because it's obscured by lead or non magical then its a normal check to look for the traps. As for when to use it, make sure there are times when player abilities do work so do not just blanket cover everything in a dungeon in lead and keep it for villains who have something more than just the general " people in this world would know" kind of excuse. They should more than know they should be particularly invested in doing , it should say something that they went to this effort such as they were expecting spell casting adventurers or something.