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Message: <blockquote data-quote="touc" data-source="post: 8134308" data-attributes="member: 19270">Depends (and illusion magic can get crazy, which makes it fun). If an f***ing door in my house suddenly appeared to me 3 feet closer than I know it should be, I should know something is seriously wrong. Yet, illusion magic operates to make me doubt my own senses. Further, it depends on the spell. Minor Image is a 5' cube whereas Silent Image is a 15' cube. In my house, my doors are all taller than 5'. So, yes, you can create a door. Will it look right? Depends on the spell. Also, lighting and sound matters. The spell creates an image, but it doesn't block light or the sound of your character letting out a nervous fart.  The only reason I can't see the caster is because I believe there's a door, though sound may make me think someone's behind the door. Light or sound where there shouldn't be any is normally a dead giveaway.So, the guard might use his Action to think about it (Investigation vs. spell DC). You might consider giving him advantage if the PCs are sloppy, such as the light source or sound issue. If he succeeds, some clue tipped him off. If he fails, he rationalizes it all in his mind and accepts the illusion.You don't just declare "I want a spy network" and it magically happens. It might take months, and a lot of coin. D&D leaves it largely up to you. Pathfinder, in its Ultimate Campaign accessory (which translate well to D&D), <a href="https://legacy.aonprd.com/ultimateCampaign/downtime/buildingsAndOrganizations.html" target="_blank">proposed this might cost around 510gp</a> to create a network of spies and thieves around town. The DMG already has rules on harvesting poisons (p258), and there's a feat in Tasha's Cauldron to auto-create damaging poison. It's a fine art, no different than modern medicine, and in D&D, it's often not cheap because poisons are seen as a feared coward's tool, equalizing the greatest warrior with the untrained peasant who wins if only they can scratch their opponent.</blockquote>

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