By means
of a hand gesture and the casting into
the air of a pinch of powdered diamond
(at least 50 gp worth of the crushed
gemstone), the spell caster creates a
powerful dweomer that negates existing
magical silence within the area of
effect, and dispels any silence created
by spell casting or magical-item power
within the area of effect for one round
per level of the spell caster after the
round of casting.

Thus, a dispel silence
cast by a 12th-level wizard would
negate (no saving throws allowed) and
silence cast on him or about his person,
and prevent such silence from occurring
or returning for twelve consecutive
rounds after casting.

Dispel magic
will in turn destroy a dispel silence
dweomer, but silence will not return
unless cast anew, or if of a permanent
(i.e., magical-item function) sort.

The
dweomer created by this spell is always
a sphere centered upon the spell caster,
extending through walls and doors,
around intervening objects, and so
forth.
 
 

Bowgentle's Book

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Books of the Forgotten Realms