Crystal Balls & Scrying

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Use of Magic Items
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DMG

Various devices for seeing at a distance (such as crystal balls, various
scrying devices such as dishes or pans of water or mirrors, and spells such
as clairaudience) are detectable. If the creature being observed in this
manner is a spell user, then consult the table given for DETECTION OF INVISIBILITY in the section entitled INVISIBILITY.
Find the creature’s Ievel / hit dice and intelligence,
    and then use the table as if an invisible creature were to be detected, checking each round.

If crystal balling or scrying in any other form is detected by the observed,
then it can be stopped by the use of darkness or dispel magic, the observed
simply noting the small disturbance in the air caused by the magical viewing
and casting the spell upon that spot, thus causing the scrying to cease
for the length of the darkness spell or for a full day in the case of dispel
magic.

 
 
 

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