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Message: <blockquote data-quote="Sword of Spirit" data-source="post: 8439348" data-attributes="member: 6677017">I‘d go with saying an illusion of an object hiding a light source also blocks the light, just as it would block vision of an object. The light being shed is part of the light source in this case. That seems like the most intuitive way you would expect the magic to work. A creature who can see through the illusion sees that light also. I guess that means it has a partially mental component.I do like how 3e had various subtypes of illusion, such as figments, glamours, phantasms, and shadows that all worked differently ways. In 3e though, having a mental aspect meant some creature weren’t affected by it the same, where 5e only applies that to spells that are fully in the mind of the viewers. Your dual-reality idea is a better way of dealing with it, but I’d simple treat the different realities as the physical reality verses the perceived reality. Rather than it being all in your head, the perceives reality is objectively presented to the world, and even mindless perceivers experience it. Those who see past it get to see both realities simultaneously.The main determinant of how the perceived reality works could be to make the spell accomplish its goals with minimal negative side effects or extra benefits. A torch behind a box shedding light doesn‘t accomplish the goal of the spell. A creature not having a shadow also doesn‘t accomplish the goal. Invisibility that blinds you and maintains your shadow definitely doesn‘t accomplish its goal. At the same time, an illusion that walls off a window, blocking the sunlight coming in and placing the whole room in darkness is granting a potential benefit not consistent with the spell’s function. I’d say that the perceived reality would still block any direct beams of light, but it would not affect the overall ambient level of light in the room. So the perceived room would be ambiently lit but experimentation would only reveal the source of the light if you passed the Investigation check (and thus saw through the illusion and could see both realities). Otherwise the light would appear to emanate from the air itself in a way that minimizes suspicion of the actual window location. Illumination would therefore be more of a “perceived” rather than physical thing in D&D.</blockquote>

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