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<blockquote data-quote="Lanefan" data-source="post: 7477346" data-attributes="member: 29398">Can't a part of the illusion be a lack of light elsewhere in the room?If an illusion can generate light in the view of those who believe it (e.g. someone casting an illusion replicating said 'light' cantrip) then by the same logic it can &quot;block&quot; light simply by having part of the illusion's effect make it appear that there is less light.&nbsp; That's awkwardly put, so let me try again: if an illusion of a person, say, can include whatever shadow that person would normally cast (and a wise illusionist would include this to help with believability) then that opens the door for an illusion appearing to block light.&nbsp; Expand that such that a small part of an illusion is a box around a light and most of the illusion is the &quot;shadow&quot; that box casts and voila: the light goes out.So an illusionist in your game could not, on hearing intruders approach, cast an illusion to make her laboratory look like an empty room?Why is that not fun?&nbsp; It's one of the best uses for illusions!&nbsp; Never mind the caster always has to be able to see through her own illusion if only so she can have it react properly to things behind it...Lanefan</blockquote>

[QUOTE="Lanefan, post: 7477346, member: 29398"] Can't a part of the illusion be a lack of light elsewhere in the room? If an illusion can generate light in the view of those who believe it (e.g. someone casting an illusion replicating said 'light' cantrip) then by the same logic it can "block" light simply by having part of the illusion's effect make it appear that there is less light. That's awkwardly put, so let me try again: if an illusion of a person, say, can include whatever shadow that person would normally cast (and a wise illusionist would include this to help with believability) then that opens the door for an illusion appearing to block light. Expand that such that a small part of an illusion is a box around a light and most of the illusion is the "shadow" that box casts and voila: the light goes out. So an illusionist in your game could not, on hearing intruders approach, cast an illusion to make her laboratory look like an empty room? Why is that not fun? It's one of the best uses for illusions! Never mind the caster always has to be able to see through her own illusion if only so she can have it react properly to things behind it... Lanefan [/QUOTE]

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