Mystra

Mystra, the mother of all magic, is a greater deity who watches over and protects the Weave of magic. She controls the weave, allowing (relatively) safe access to the power of raw magic to mortal spellcasters and magical craftsmen.

Description
The legend of Mystra claims that she was once a young, mortal girl who was just beginning her studies of the art of magic. She was recruited by the Overgod, Azanzi, to protect the Weave. As the Lady of Spells, Mystra was said to be a manifestation of magical balance, maintaining order in the world of magic by correcting great inequalities if things went askew. One of her first acts as a goddess was to ban the use of all magic greater than tenth level. This eventually came to be known as "Mystra's Ban".

Appearance
As a goddess, Mystra could shape change at will and mortals who saw her reported that she was ever-shifting. Others described her appearance as a multicolored will-o'-wisp.