Subject: Illusion Rules
From: [email-masked] (Bruce Mclaren)
Date: Mon, 6 Nov 95 10:28:29 CST

Illusion Spells 
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        These are the spells that let the wizard make 
what is not appear to be.  An illusion has no 
real substance.  Each illusion counts as a spell 
on, giving -1 to the caster's other spell rolls.

        Any illusion can be destroyed or dispelled, if 
an intelligent creature takes a turn to Concentrate 
and successfully disbelieves it.  To disbelieve, 
the viewer must win a Contest of Skills: his IQ, 
vs. the appropriate Illusion spell skill of the 
original caster.  The viewer is at +2 if he already 
knows the illusion to be false, -2 if he wants to 
believe.  A critical success by the viewer will 
always disbelieve successfully.  Note that once 
disbelieved, the illusion is dispelled only for that 
viewer, others may still believe the illusion to be 
real.  Once successful at disbelieving, the viewer 
will see nothing of the illusion, it will completely 
disappear from his senses.

        Illusions are magical energies applied 
directly to the sense nerves of the subject.  
Because the energy is applied directly but subtly, 
this is one of the more difficult realms of magic. 
The subject's own mind will try to make sense of 
the images, even filling in details the caster might 
have missed or not known.  An illusion is seldom 
described by all viewers the same way.  Of 
course this is true of reality, too.

        This is based on GURPS Magic, Steve 
Jackson (Steve Jackson Games (c) 1990) pgs. 
45-47, with additional information from 
DragonQuest 3rd ed. (TSR (c) 1989)  pgs. 42-43 
(but the ideas are from the 2nd ed., which is SPI 
(c) 1982).

Basic Illusion Spells

Visual Illusion Area

        Creates an insubstantial visual image.  The 
illusion effects no senses except vision.  The 
touch of any intelligent creature, or any attack, or 
any spell except Control Illusion, will dispel it.  
Other things will just go through it.  It may move 
beyond its starting area, or change size or shape 
up to its maximum size, but the caster must 
concentrate to do this.

        Duration:  1 minute.
        Base Cost:  1 to cast; half that to maintain.
        Prerequisite:  caster must be able to see, and 
        have IQ 11 or better.

Audio Illusion  Area

        Creates an insubstantial auditory image.  The 
illusion effects no senses except hearing.  Any 
spell except Control Illusion will dispel it.  It may 
move beyond its starting area, but the caster must 
concentrate to do this.

        Duration:  1 minute.
        Base Cost:  1 to cast; half that to maintain.
        Prerequisite:  caster must be able to hear, 
        and have IQ 11 or better.

Olfactory Illusion      Area

        Creates an insubstantial olfactory image.  
The illusion effects no senses except smell.  Any 
spell except Control Illusion will dispel it.  It may 
move beyond its starting area, but the caster must 
concentrate to do this.

        Duration:  1 minute.
        Base Cost:  1 to cast; half that to maintain.
        Prerequisite:  caster must be able to smell, 
        and have IQ 11 or better.

Tactile Illusion        Area

        Creates an insubstantial tactile image.  The 
illusion effects no senses except touch.  Any spell 
except Control Illusion will dispel it.  It may 
move beyond its starting area, but the caster must 
concentrate to do this.

        For an illusion to directly cause damage, it 
must have a tactile component.  Illusions can't 
actually cause damage, but the subject's belief  
that he has been hurt is often sufficient for the 
caster's purposes.  Damage will accrue, but 
bones will not break, shock may occur, but the 
bleeding is only in the subject's mind, etc.  If 
death is indicated by the damage done by an 
illusion, the subject is merely unconscious.

        Duration:  1 minute.
        Base Cost:  1 to cast; half that to maintain.
        Prerequisite:  caster must be able to feel, and 
        have IQ 11 or better.

Taste Illusion  Area

        Creates an insubstantial taste image.  The 
illusion effects no senses except taste.  Any spell 
except Control Illusion will dispel it.  

        Duration:  1 minute.
        Base Cost:  1 to cast; half that to maintain.
        Prerequisite:  caster must be able to taste, 
        and have IQ 11 or better.

Advanced Illusion Spells

        Advanced Illusion spells are combinations of 
the Basic Illusion spells.  These combinations 
make disbelief more difficult.  However these 
spells require more skill, intelligence, and power.  
Each Advanced Illusion counts as only a single 
spell on.

Two Sense Illusion      Area

        Creates an insubstantial image of the 
combination of any two Basic Illusion spells.  
The same rules apply to the combination as 
applied to the individual spells.

        Duration:  1 minute.
        Base Cost:  2 to cast; half that to maintain.
        Prerequisite:  caster must have both senses 
        being effected, the two Basic Illusion spells being 
        combined, and have IQ 12 or better.

Three Sense Illusion    Area

        Creates an insubstantial image of the 
combination of any three Basic Illusion spells.  
The same rules apply to the combination as 
applied to the individual spells.

        Duration:  1 minute.
        Base Cost:  3 to cast; half that to maintain.
        Prerequisite:  caster must have all three 
        senses being effected, Magery, Two Sense 
        Illusion, the three Basic Illusion spells being 
        combined, and have IQ 13 or better.

Four Sense Illusion (VH)        Area

        Creates an insubstantial image of the 
combination of any four Basic Illusion spells.  
The same rules apply to the combination as 
applied to the individual spells.

        Duration:  1 minute.
        Base Cost:  4 to cast; half that to maintain.
        Prerequisite:  caster must have all four 
        senses being effected, Magery, Three Sense 
        Illusion, the four Basic Illusion spells being 
        combined, and have IQ 14 or better.

Five Sense Illusion (VH)        Area

        Creates an insubstantial image of the 
combination of any five Basic Illusion spells.  
The same rules apply to the combination as 
applied to the individual spells.

        Duration:  1 minute.
        Base Cost:  5 to cast; half that to maintain.
        Prerequisite:  caster must have all five senses 
        being effected, Magery 2, Four Sense Illusion, 
        all five Basic Illusion spells, and have IQ 15 or 
        better.

Additional Spells

The following spells were also kept in very slightly modified forms.
The modifications were slight enough that I fear treading on copyrights
to post them.  Fill in the details as you like. :)

Illusion Shell  
Illusion Disguise       
Control Illusion
Dispel Illusion 
Know Illusion
Independence