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Message: <blockquote data-quote="Tony Vargas" data-source="post: 6592502" data-attributes="member: 996">A long, long time ago, someone I was gaming with created 'an Illusion of Darkness,' basically, used Phantasmal Forces to cast what looked like Darkness 15' radius.  No on disbelieved, because Darkness 15'r was a well-known spell, and he essentially created darkness he could see through (and so could any allies he quietly tipped off who made their saves).Phantasmal Forces was a 3rd level spell back then, and Darkness 15r was 2nd.  Maybe that wasn't so abusive.Should a cantrip do the same thing?  I'd rule against this trick out of hand, as a DM.  It's obviously too much.  The rationalization could be that the illusion isn't really of an iron box, but of a whole room plunged into darkness, and that's far beyond the AE of the spell.  That'd leave open 'illusions of darkness' using a more powerful spell.  An illusion of a 'formless grey mist' could serve a similar purpose - blocking LoS, but not light, itself.Another consideration is the interaction of light sources and invisibility.  If an invisible character is carrying a light source, is the source invisible?  Does it still illuminate the area?  In past eds, that's been the case.  Another consideration is that being affected by an illusion generally requires seeing it, and if the room is plunged into darkness, you won't be able to see the iron box, so you won't be affected by the illusion, which means the iron box isn't there for you, which means the room is lit, which means you can see the iron box, which means you're affected by the illusion, which means the room is plunged into darkness, which means you can't see the iron box....</blockquote>

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