Mythal

A mythal was a powerful magical effect, created by a group of spellcasters to protect and ward a large area with numerous powerful enchantments. The earliest mythals were created by a circle of elven High Mages. Mythals could permanently alter The Weave to create an area wherein the normal rules of magic no longer applied. A typical mythal prevented certain schools of magic from being employed while empowering others. It could restrict access to the warded area to certain classes of beings. For example, Silverymoon's mythal excluded evil dragons. Creation of a mythal sometimes required the willing sacrifice of the lead caster's life, a result that led to the first mythal's being named after its creator. In addition, many mythal spells corroded over time, and if not maintained could become corrupted. This had occurred in Myth Drannor and resulted in the state of that city