Lazatar's Spellstopper
(Abjuration)

Range:  0
Components:  V, S, M
Duration:  Permanent
Casting Time:  2 hours
Area of Effect:  100 square foot section of wall per level
Saving Throw:  None

This very potent abjuration is used to protect a castle, keep, city, etc. from one or more enemy spells. For each level the wizard has obtained, he may protect up to a 100 square foot section of wall; more than one application of this spell may be cast on a single wall at once, as long as the areas of protection do not overlap (the wizard may shrink the area of effect to any size less than the maximum, as desired); in other words, no one brick of the wall may be under protection by more than one spellstopper at a time. The protection afforded by this spell extends to individuals on top of an affected wall.
Spellstopper may be used to affect one other spell for each level of the wizard; thus, a 19th-level wizard may provide protection against 19 other spells directed at the protected area. These affected spells may be any spells, with the exception of wish and dispel magic; however, the chosen spells must be ones the wizard already has learned. Once this spell is cast, any of the chosen spells directed at the protected area automatically fail; spellstopper has no effect on other spells.
Spellstopper may be removed by wish or it may be dispelled. For every non-chosen spell cast at the area of effect, the chance for dispelling spellstopper is increased a percentage equal to the level of the spell. This bonus is cumulative (up to 25%) and lasts for one turn. In order to earn this bonus, the wall itself must be targeted; an attack directed at a defender on top of the wall does not contribute to this bonus.
As an example, let us assume a wall is protected from, among other spells, passwall, and magic missile, and that fireball and transmute rock to mud are not affected. On the first round, magic missile is directed at one of the defenders; since the wall protects its defenders, the spell is stopped. The next round, passwall is cast on the wall; since it too is a chosen spell, passwall has no effect. On the third round, fireball is cast at the defenders, and since it was not named during the casting of spellstopper, it has full effect; in addition, if dispel magic was cast within one turn, it would have a 3% bonus, since fireball is a 3rd-level spell. Nine rounds after fireball was cast, transmute rock to mud is cast on the wall; it too has full effect; if dispel magic was cast now, it would have an 8% bonus applied to it (3% for the fireball and 5% for rock to mud). Two rounds later, another rock to mud is cast; subsequent dispel attempts now have and 10% bonus (5% for each rock to mud; the 3% for fireball no longer applies, as it has been more than 10 rounds since it was cast).
Each casting of spellstopper temporarily reduces the wizard's Constitution by 1d4 points; an hour of undisturbed rest will restore one Constitution point lost in this manner. If the wizard's Constitution is reduced to 0 or less by casting this spell, he must make a successful system shock roll to prevent actual death.
The material components for this spell are a thin sheet of lead, as well as the material components for all spells spellstopper will protect against. The wizard can only protect against spells he can cast himself.

