This is some important info about Abjuration that didn't deserve its own little article. Abjuration at its core is protection magic. Since it's protection magic, you can imagine that there'd be some consequences for using it improperly (and by improperly, I mean without provocation).
For example; curses, hexes, demonic harassment, and even death, which may occur from the aforementioned curses, hexes, and demonic harassment. If you're bad enough, you might just get sent to another dimension! How delightful. Because of this (in Gremlins and 2153), the League of Sorcerers has placed nearly zero laws on Abjuration magic, with the exception of Banishment.
Anyway, nearly every Abjuration spell appears turquoise in color. The side effects of each spell vary from spell to spell, but you can expect to be tired from each one (especially if you're not endowed with much Ether).
Abjuration utilizes martial arts-style movements similar to Aikido, with little splashes of other martial arts, and incorporates the Japanese language (the majority of spells don't require you to speak Japanese, but it does help with their power. Some spells require you to speak in other Asian languages). A majority of the spells don't require material components, but when they do, the most common instrument is a Jo staff, commonly used in Aikido. A good amount of these are able to be cast without a Jo staff. Though many Abjurers find their abilities are helped greatly when they do.
The practice of Abjuration doesn't even change that much after the events of 2153. The base movements and such are still there, due to some sort of magical hardwiring. And even the language is the same- except the casters don't exactly understand what they're saying.
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