Corruption (Magic)
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Basic Information

Corruption, when considered with reference to magic, concerns the idea that prolonged used of magic - especially the less savoury kinds - leaves a physical mark on the worker's body as much as a spiritual one on their soul.

This can be used as an explanation for why wizards, especially evil ones, are always old, ugly and deformed: however they started out, extensive use of left-hand path magic has twisted them into something vile. Where it applies, it may well be a source and partial justification for memes such as ugly-equals-evil.

How it works is very setting dependent - in some cases, magic is a tool of Chaos and an inherently mutationary influence, in others magic is simply a tool that shapes the universe and corruption is the natural result of tool and user growing to fit one another - if your magic is ugly and unnatural, you will grow into an ugly and unnatural shape, just as your hand would callous around an oddly shaped hand-tool. Other explanations are possible.

For inspiration as to what exactly magic may do to a user, try some of the "tells" from glamour failure.

Sources

Bibliography
1. full source reference

Game and Story Use

  • Usually works best when built into the magic system - and is great when all magic corrupts, forcing PC users to weigh up a variety of costs when using.
    • e.g. The magic system from The Riddle of Steel doesn't exactly corrupt, but does age users - meaning that heavy users of magic will always end up looking old, regardless how long they've actually been around for.
  • The Dresdenverse includes the wrinkle that part of magical corruption makes it easier to perform certain kinds of magic - although this may as much be a psychological process as a thaumatological one given the heavy emphasis on self-belief in working magic in that setting. The RPG offers concrete bonuses to each offence against "the laws of magic" after the first to model this.
  • Your rules system may also have a parallel casting process which is easier (perhaps simulated by a bonus) or has greater supplies of energy, but which is inherently corrupt or otherwise inappropriate for general use. This may also be addictive and/or long term use may make it harder to do things properly - which may allow the bad guys a benefit from "casting black" but mean that, due to their persistent tendency to take shortcuts and grab easy energy, they are neither as skilled nor as powerful as someone who has always done things properly.
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