True Dweomers and Quest Spells (HLC)

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As powerful as a true dweomer is, it is still mortal magic. Quest spell effects, which represent a deity's direct intervention in the world, generally cannot be countered by true dweomers. A dispel true dweomer is ineffective against a quest spell effect.
If a quest spell produces a creature, object, or other effect that can be attacked or destroyed by normal means or spells, a true dweomer can be used to attack it. For example, a banish true dweomer cannot remove the creatures summoned by a wolf spirits quest spell, but a slay or strike true dweomer can harm the individual wolf spirits.
Ward true dweomers can work against quest spell effects if the protection is relevant. For example, a ward that provides protection from electrical attacks is effective against the lightning bolts generated from a storm of vengeance quest spell, but not the spell's other effects.
If the quest spell allows a saving throw, the ward works normally. If the quest spell does not allow a saving throw, anything protected by a ward gains a saving throw of 18. If the ward provides magic resistance, its value is halved vs. quest spell effects.