A know alignment spell enables the wizard to read the aura of a creature or an aligned object
(unaligned objects reveal nothing). The caster must remain stationary and
concentrate on the subject for two full rounds. A creature is allowed a saving throw
vs. spell and, if successful, the caster learns nothing about that particular
creature from the casting. If the caster concentrates on a creature or object
for only one round, he can learn only its alignment with respect to law and
chaos. Certain magical devices negate the know alignment spell.
The reverse, undetectable alignment, conceals the alignment of an object or creature for 24 hours--even from a know alignment spell.
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