This spell is essentially a spectral forces spell that operates through a program (similar to a programmed illusion spell) determined by the caster. It is thus unnecessary for the wizard to
concentrate on the spell for longer than the round of casting it, as the program
has then started and will continue without supervision. The illusion has visual,
audio, olfactory, and thermal components. If any viewer actively attempts to
disbelieve the spell, he gains a saving throw vs. spell. If any viewer
successfully disbelieves and communicates this fact to other viewers, each such viewer
gains a saving throw vs. spell with a +4 bonus.
The material components are a bit of fleece and several grains of sand.
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