gnfnrf said:
Spells that apparently cannot be removed by Dispel Magic:
Sepia Snake Sigil (after triggered)
"If the target fails its save, it is engulfed in a shimmering amber field of force and immobilized until released, either at your command or when 1d4 days + one day per caster level have elapsed."
This is the secondary effect of the spell. Later, there is a line that states "A dispel magic can remove the sigil". Still, I would contend that Dispel Magic would free the victim as though 1d4+1 day/caster level had elapsed. As mentioned, "a dispelled spell ends as if its duration had expired". Also, "Dispel magic can dispel (but not counter) spell-like effects just as it does spells." So if you want to take the paralyzation caused by sepia snake sigil as a spell-like effect, it's covered, too.
Protection From Energy (with resist energy as well)
"If a character is warded by protection from energy and resist energy, the protection spell absorbs damage until its power is exhausted."
If the spell is successfully dispelled, is the character still "warded by protection from energy and resist energy"? If so, then was the spell successfully dispelled at all? If not, then this line is entirely irrelevant. Before it has been dispelled, however, this line defines how the spell behaves. Until the power is exhausted, it absorbs damage.
Animal Shapes
"Recipients remain in the animal form until the spell expires or until you dismiss it for all recipients. In addition, an individual subject may choose to resume its normal form as a full-round action; doing so ends the spell for that subject alone."
Dispel Magic ends a spell as though it had expired. Therefore, a successfully dispelled Animal Shapes has the characters on which the effect was ended returning to their original forms, just as it says in the spell.
Control Winds
"The new wind direction and strength persist until the spell ends or until you choose to alter your handiwork, which requires concentration."
See my reply to Animal Shapes.
Glitterdust (mentioned in edit above)
"All within the area are covered by the dust, which cannot be removed and continues to sparkle until it fades."
I agree with you, on this one. Except that I believe that the end of the line means that when the spell ends, the dust fades. Otherwise, it would make no sense to me. However, I think this is just a matter of interpretation. Therefore, according to my interpretation of the spell, Dispel Magic would cause the blindness to end and the outlining to end, at least, and the sparklies to go away at most. Probably all of the above.
Now, many of these are silly. But I remind you, the wording in them is substantially the same as feeblemind.
Feeblemind
"The subject remains in this state until a heal, limited wish, miracle, or wish spell is used to cancel the effect of the feeblemind."
I contend that "until the spell ends due to the end of its duration" is very different than "until these four, specific spells are used". After all, Dispel Magic specifically states that it causes a spell to end as though its duration was over, which fits within the "until" clause used in those spells. Actually, it fits in the same way that Mass Heal being allowed on Feeblemind does.
The point of all of this is to say that I believe the "until" construction is not intended to be strictly read. It is simply a way of stating means of removing the effect, not an exhaustive way. If you read it strictly in one spell, you have to read it strictly in many spells, and the game becomes less playable.
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gnfnrf
Using my above interpretations, which are often just due to careful readings of the spells and to which I can only see easy variation within the RAW under Glitterdust, and not even then, it's easy to strictly read the "until" clauses in every spell and play the game using the RAW.