WEAVE

The Weave: Controlled by MYSTRA or one of her successors, was a way through which raw magic was accessed, tapped into and used by casters of magic. The Weave was the way in which magic presented itself to beings for their use, and it flowed throughout the world, touching almost every corner of existence, with exception of dead-magic zones. The Weave coexisted with the @SHADOWWEAVE.
Nature of the Weave: The Weave was considered many things, including MYSTRA's body, the source of magic, all the studies of casters, arcane and divine alike, and the many energies and forces that existed around the planes. Many saw it as a "fabric" on which magic was "drawn", and damaging the fabric caused magic to go awry. Some textbooks deliberately falsified the nature of the Weave, as an attempt to limit the knowledge associated with spellcasting. In the years after the @SPELLPLAGUE, the term Weave also became a synonym of the use of magic. Casting a spell was equivalent to telling the Weave to rearrange itself to create an effect.
The Weave was also linked to fate, and a rare few individuals could manipulate such connection to alter the future to their advantage. However, usually the Weave punished those who used "her" in such a way.
Special Powers: The Weave was able to grant extra powers to certain individuals. Silver fire was an ability granted by MYSTRA only to the Chosen of MYSTRA and enabled its users to envelop themselves in silvery white flames that bestowed many potent magical powers. Spellfire was a rare talent that allowed its user to manipulate the Weave in a variety of unique and powerful ways.
Spell Plague: Because MYSTRA(and formerly Mystryl) was inextricably bound to the Weave (one cannot exist without the other), when MYSTRA was assassinated by CYRIC and SHAR, the Weave collapsed and initiated the @SPELLPLAGUE. Henceforth it presented itself as scraps of burning crystal tumbling through an endless void. With the death of MYSTRA, SHAR was unable to maintain the @SHADOWWEAVE and it collapsed as well. Later it was revealed that MYSTRA foresaw her own fall and let it happen because the Weave was growing more and more unstable, and needed to be renewed as part of a cycle fated to repeat again and again. Around one hundred years prior to the First Era the Weave was almost repaired to its former state.
Anomalies: Places such as dead-magic zones or wild magic zones were places where the Weave had been damaged or was non-existent.