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Infinite Worlds / Magic

Enhanced or Impeded Magic

Source Galaxy Exploration Manual pg. 111
The easiest way to simulate variable magic in your game is to treat magic as enhanced or impeded. Enhanced magic functions at a higher caster level, typically 2 higher. Much higher than that could become too powerful for the PCs’ level. Impeded magic can function with unexpected side effects, or even opposite than intended. Particularly impeded magic might require a spellcaster to succeed at a caster level check (DC = 15 + the spell’s level) to cast the spell at all. Failure results in the spell failing while the spell slot used is still consumed. For spells cast from magic items, instead use a Will saving throw (DC = 10 + twice the spell level).
Similar to some planes, entire worlds, regions, or locales might enhance or impede magic of specific schools or descriptors. Such changes to magic help reinforce the character of a place. For example, the Shadow Plane enhances shadow magic and impedes spells that use or produce fire or light.
Another option for unstable high magic is an environment where magic triggers uncontrolled reactions. To create this situation, you might have a creature using a spell or a spell-like ability attempt a Will saving throw (DC = 10 + twice the spell level). On a failure, roll on the table for the wonder warp spell, but you, the GM, control the results.
Impede magic only rarely. Doing so restricts the capabilities of some characters, making the game less fun for their players. Be doubly careful with the absence of magic. Impeded or absent magic might serve as a challenge for a short while, but it can feel frustrating or even punitive if prolonged.