Strengthen Illusions
(Alteration, Metamagic, Illusion)

Range:  0
Components:  V, S, M
Duration:  Special
Casting Time:  2 rounds
Area of Effect:  Creature touched
Saving Throw:  Negates

This spell strengthens illusions to the point that even undead or successful disbelievers still believe in them. The spell gives one spell level per caster level. With these spell levels, illusions of any level may be strengthened. Undead or successful disbelievers have to save versus spell (in addition to the normal saving throws, if applicable) at a -1 per caster level and +1 for each of their own levels or Hit Dice. If successful, the illusion vanishes like any normal illusion; if it fails, the illusion affects them normally. The saving throw may be modified further by the caster if he gives up additional spell levels. Every time an additional amount to the normal amount of spell levels is used, the saving throw is adjusted by -2. Thus, it may be even more likely that the illusion affects the targets normally. The casting times for these illusion spells are increased by one unit per spell level given up for them (an improved phantasmal force with a casting time of 2 is strengthened by this spell with 6 spell levels; while this reduces the saving throw versus spell by -4, the casting time increases to 8).
This spell may be cast multiple times on one person by the same caster. It has to be the same caster who uses the same spell on the same person multiple times. This is called stacking or layering. The stacking or layering effect will be used quite often in many of the following spells. The effect of stacking or layering will be given in a form something like the following: "the spell strengthen illusions may be layered for a maximum effect of 3 spell levels per caster level". This means that the target creature can store a maximum of one spell level of effect in its person at once.
The material component is a mithril coin of at least 10 gp worth for every spell level gained.

