Ok, let's look at this again. Silence is a non-instantaneous area of effect spell with a Will save. Let's compare it to other non-instantaneous are of effect spells that grant a will save.
PRPG said:
SILENCE
School illusion (glamer); Level bard 2, cleric 2
Casting Time 1 round
Components V, S
Range long (400 ft. + 40 ft./level)
Area 20-ft.-radius emanation centered on a creature, object, or
point in space
Duration 1 round/level (D)
Saving Throw: Will negates; see text or none (object); Spell
Resistance: yes; see text or no (object)
Upon the casting of this spell, complete silence prevails in the
affected area. All sound is stopped: Conversation is impossible,
spells with verbal components cannot be cast, and no noise
whatsoever issues from, enters, or passes through the area. The
spell can be cast on a point in space, but the effect is stationary
unless cast on a mobile object. The spell can be centered on
a creature, and the effect then radiates from the creature and
moves as it moves. An unwilling creature can attempt a Will save
to negate the spell and can use spell resistance, if any. Items in a
creature’s possession or magic items that emit sound receive the
benefits of saves and spell resistance, but unattended objects and
points in space do not. Creatures in an area of a silence spell are
immune to sonic or language-based attacks, spells, and effects.
I understand there is no "Target" entry for this spell, but that doesn't mean it can't "target" (no capital "T") anything. "Centered on" and "cast on" aren't defined in the rules like "Targets" are, admittedly, but let's look at other similar spells and how they are worded.
PRPG said:
SLEEP
School enchantment (compulsion) [mind-affecting]; Level bard 1,
sorcerer/wizard 1
Casting Time 1 round
Components V, S, M (fine sand, rose petals, or a live cricket)
Range medium (100 ft. + 10 ft./level)
Area one or more living creatures within a 10-ft.-radius burst
Duration 1 min./level
Saving Throw Will negates; Spell Resistance yes
A sleep spell causes a magical slumber to come upon 4 HD of
creatures. Creatures with the fewest HD are affected first. Among
creatures with equal HD, those who are closest to the spell’s point
of origin are affected first. HD that are not sufficient to affect
a creature are wasted. Sleeping creatures are helpless. Slapping
or wounding awakens an affected creature, but normal noise does
not. Awakening a creature is a standard action (an application of the
aid another action). Sleep does not target unconscious creatures,
constructs, or undead creatures.
PRPG said:
SONG OF DISCORD
School enchantment (compulsion) [mind-affecting, sonic]; Level
bard 5
Casting Time 1 standard action
Components V, S
Range medium (100 ft. + 10 ft./level)
Area creatures within a 20-ft.-radius spread
Duration 1 round/level
Saving Throw Will negates; Spell Resistance yes
This spell causes those within the area to turn on each other
rather than attack their foes. Each affected creature has a 50%
chance to attack the nearest target each round. (Roll to determine
each creature’s behavior every round at the beginning of its turn.)
A creature that does not attack its nearest neighbor is free to act
normally for that round. Creatures forced by a song of discord to
attack their fellows employ all methods at their disposal, choosing
their deadliest spells and most advantageous combat tactics. They
do not, however, harm targets that have fallen unconscious.
In both of these cases, we have non-instantaneous, Will negates, area affecting spells. In both of these cases, the Area line specifically mentions "Creatures". Let's look at the rules for area affect spells again, shall we?
PRPG said:
Creatures: A spell with this kind of area affects creatures
directly (like a targeted spell), but it affects all creatures in
an area of some kind rather than individual creatures you
select. The area might be a spherical burst, a cone-shaped
burst, or some other shape.
Since Silence doesn't have this wording, it is obvious that creatures in the area of effect not directly "centered" on them don't get saves to negate. It's not an individual affect. In fact Silence has wording expressing addressing how it works:
PRPG said:
SILENCE
School illusion (glamer); Level bard 2, cleric 2
Casting Time 1 round
Components V, S
Range long (400 ft. + 40 ft./level)
Area 20-ft.-radius emanation centered on a creature, object, or
point in space
Duration 1 round/level (D)
Saving Throw: Will negates; see text or none (object); Spell
Resistance: yes; see text or no (object)
Upon the casting of this spell, complete silence prevails in the
affected area. All sound is stopped: Conversation is impossible,
spells with verbal components cannot be cast, and no noise
whatsoever issues from, enters, or passes through the area. The
spell can be cast on a point in space, but the effect is stationary
unless cast on a mobile object. The spell can be centered on
a creature, and the effect then radiates from the creature and
moves as it moves. An unwilling creature can attempt a Will save
to negate the spell and can use spell resistance, if any. Items in a
creature’s possession or magic items that emit sound receive the
benefits of saves and spell resistance, but unattended objects and
points in space do not. Creatures in an area of a silence spell are
immune to sonic or language-based attacks, spells, and effects.
The spell description doesn't say "unwilling creatureS" get a save, nor does it say a successful save negates the spell for that creature only. Every other non-instantaneous AoE spell (at least the ones that allow a save) specifiy what happens to creatures entering the area after the spell is cast, but this one doesn't. It appears to me that the only time a Will save is allowed is when the creature making the save is to be designated the point of origin. In such case, that creature and ONLY that creature gets a Will save, and if successful the entire spell is kaput. The only exceptions to this are explicitly mentioned in the description, namely magic items or items in the posession of a creature that are sound sources themselves (since non-magical items not in the posession of a creature don't get saves anyway).
I'm curious Pawsplay, how do you rule Silence in your games? Honestly, do you let everyone in the area of a silence get a Will save? Are you arguing for that case, or just trying to argue how the rules are currently written and are lobbying for erratta? I can see where on first glance the "Will negates" line makes it seem that way, but the spell description goes on to pretty much explain differently. Especially since it says "no noise whatsoever issues from, enters, or passes through the area", implying that even if you did make a save, you still can't hear anything while in the AoE. There is no "Target" line in the spell block, but the description states "the effect is stationary
unless cast on a mobile object", which pretty much says to me it's targeting an object. Finally, it states "The spell can be centered on
a creature, and the effect then radiates from the creature and
moves as it moves. An unwilling creature can attempt a Will save
to negate the spell." The second line isn't immediately after the first by coincidence, it's expressly stating how and when a Will save is called for. Seems pretty clear to me, but I will admit my perception is influenced by how spells worked in all the previous editions. When in doubt, I always use the spell how it's always worked, unless clear and unambiguous evidence dictates otherwise.