Prerequisite Counts & Spells for GURPS Magic

[Curmudgeon]

The posts in this thread give the spells that constitute the prerequisite counts in the Spell Table Appendix of GURPS Magic, pp.223-237.

Each prerequisite count is peculiar to that particular spell, or in other words, the prerequisite count is not concerned with how or why a spell ended up in the prerequisite count, only with whether you have to put a point into that spell before you can learn this spell. The prerequisite counts always assume the fewest possible spells to be the case. If a spell has a spell or an advantage as prerequisites, it assumes that the advantage is present. E.g., Beast-Soother (Magic p. 224 of the table) lists Persuasion, a spell, or Animal Empathy, an Advantage, as prerequisites and gives a prerequisite count of 0.

Alternate Prerequisites (Magic p.200) notes that the prerequisite counts given in the table do not account for non-spell prerequisites and suggests adding 1 to the count for every 10 character points of required traits.

The spells I give as making up the prerequisite count fall into one of two different categories. Those simply listed by name are specifically required as prerequisites and another spell cannot substitute for it. Those listed as by name followed by parentheses have more flexible parameters (whether that be a different spell of the same College or a spell from a different College entirely) and could have a different spell substitute for it while still meeting the count prerequisites.

[Curmudgeon]

Accelerate Time (count 20):

Purify Air (any other Air College spell or if Seek Air is changed any spell of a College not already listed)
Seek Air (any other Air College spell or if Purify Air is changed any spell of a College not already listed)

Itch (any other Body Control College spell or if Touch is changed any spell of a College not already listed)
Touch (any other Body Control College spell or if Itch is changed any spell of a College not already listed)

Sense Emotion (any other Communication and Empathy College spell or if Sense Foes is changed any spell of a College not already listed)
Sense Foes (any other Communication and Empathy College spell or if Sense Emotion is changed any spell of a College not already listed)

Seek Earth (any other Earth College spell or if Shape Earth is changed any spell of a College not already listed)
Shape Earth (any other Earth College spell or if Seek Earth is changed any spell of a College not already listed)

Ignite Fire (any other Fire College spell or if Seek Fire is changed any spell of a College not already listed)
Seek Fire (any other Fire College spell or if Ignite Fire is changed any spell of a College not already listed)

Seek Food (any other Food College spell or if Test Food is changed any spell of a College not already listed)
Test Food (any other Food College spell or if Seek Food is changed any spell of a College not already listed)

Lend Energy (any other Healing College spell or if Recover Energy is changed any spell of a College not already listed)
Recover Energy (any other Healing College spell or if Lend Energy is changed any spell of a College not already listed)

Simple Illusion (any other Illusion and Creation College spell or if Illusion Disguise is changed any spell of a College not already listed)
Illusion Disguise (any other Illusion and Creation College spell or if Simple Illusion is changed any spell of a College not already listed)

Measurement (any other Knowledge College spell or if Tell Time is changed any spell of a College not already listed)
Tell Time (any other Knowledge College spell or if Measurement is changed any spell of a College not already listed)

Light (any other Light and Darkness College spell or if Colors is changed any spell of a College not already listed)
Colors (any other Light and Darkness College spell or if Light is changed any spell of a College not already listed)

[Curmudgeon]

Accuracy (count 15):

Enchant
Purify Air [counts for both Enchant and as an Air College spell]
Itch (or a spell of any other College not already listed)
Sense Foe (or a spell of any other College not already listed)
Ignite Fire (or a spell of any other College not already listed)
Lend Energy (or a spell of any other College not already listed)
Seek Water (or a spell of any other College not already listed)
Seek Earth (or a spell of any other College not already listed)
Sound (or a spell of any other College not already listed)
Simple Illusion (or a spell of any other College not already listed)
Seek Plant (or a spell of any other College not already listed)

Create Air (or any other Air College spell)
Stench (or any other Air College spell)
Shape Air (or any other Air College spell)
Air Jet (or any other Air College spell)

[Curmudgeon]

Acid Ball (count 8):

Create Acid

Create Water
Purify Water
Seek Water

Create Earth
Earth to Stone
Shape Earth
Seek Earth

[Curmudgeon]

Acid Jet (count 10):

Create Acid

Create Water
Purify Water
Seek Water

Create Earth
Earth to Stone
Shape Earth
Seek Earth

Water Jet
Shape Water

[Curmudgeon]

Adjustable Clothing (count 14):

Enchant
Purify Air (or any other Air spell; [also counts as a spell of a different college])
Seek Earth (or any other Earth spell; [also counts as a spell of a different college])
Ignite Fire (or any other Fire spell; [also counts as a spell of a different college])
Seek Water (or any other Water spell; [also counts as a spell of a different college])
Itch (or any spell of a College not already listed)
Sense Foes (or any spell of a College not already listed)
Lend Energy (or any spell of a College not already listed)
Sound (or any spell of a College not already listed)
Simple Illusion (or any spell of a College not already listed)

Reshape
Weaken
Find Weakness [also counts as a spell of a different College for Enchant]
Shape Earth