Something that I've struggled with for a while in TW is hidden traps. These only seem to activate when you move over them, and I've had many runs over the years ruined when I move over something that instantly kills me like a glass shards trap. I can't seem to figure out what spell is supposed to identify these hidden traps and reveal them from a distance. I've tried a number of spells and the light spell you always have available; what am I missing? Are you supposed to summon creatures and have them check every tile and hallway by having them move over squares for you? I haven't actually checked if using summons will reveal traps or not as it's pretty far into the game when they start to appear and by then I forget to be more diligent about it and tend to set one off that kills me.

I haven't played TW in years since I hadn't been able to find a "search" function ingame and kind of gave up on completing it, and was never able to get a definitive answer if such a thing existed. I am curious though so I figured I'd try again: is there a way to locate and identify invisible traps safely?