Up to 50 archmages who are each 18th-level spellcasters are required to perform this epic magic ritual. The Dracorage mythal was a ritual performed near the end of the Age of Dragons by Elven High Mages, in order to finally defeat the dragon lords. The mythal had an enchantment effect with a planet-wide range, it caused all dragons to lose their reason and become raging beasts. This effect lasted for ten to sixty days.
There were no means to stop the effects of the Dracorage mythal completely by natural or magical methods. Most spells were ineffective and even wish or miracle spells only mitigated the effects if cast daily.
It was created in an Elven High Magic ritual using an 11th level spell, cast by numerous elven archmages who gave their lives in the casting. It converted raw magic from the Weave and sent that power throughout the planet in one powerful pulse.
The Dracorage Mythal was a desperate attempt to bring an end to the reign of dragons over the planet by the elves. The elves had observed the effects of the King-Killer Star, a red comet which caused the dragons to go into a temporary blood rage. The mythal replicated this effect, taking some of the comet's energy the last time it had passed above.
In −24,000 DR, the elves made a surprise attack and performed the mythal ritual while the dragons were unaware of its existence. The dragons flew into an uncontrollable rage, killing everything they saw, including their subjects and their own offspring, and each other. In the ensuing chaos, the elves rose in war against the dragons and repeatedly activated the mythal. The dragons lost all support from their subjects, who began fighting off the dragons too. In a desperate attempt to cling to power, the last dragon lords tried to destroy the Dracorage Mythal and its casters, but were defeated. The elves defeated the last dragon lords, and put an end to the Age of Dragons, and began the Age of Elves.
The Dracorage Mythal has not been activated in millennia, and the knowledge of how to perform it has been lost to history.
(Note: This is actually an 11th level spell)
* - (The leading spellcasters, which the spell consumes)