Dracorage
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_Tara peruses the shelves for mentions of Dracorage. She specifically searches for (1) what it is, (2) what its effects are, (3) what it affects, (4) how it is delivered, (5) how long it lasts, (6) the most recent use of it, and (7) if there are any known antidotes, neutralizers, or counterspells.
Provided her search is fruitless, she asks a librarian if they have the contact information of any known scholars who could be considered specialists in the field of dragons._
// I'm really sorry for writing this, but Tara would be thorough about this. I think I listed the knowledge in least-plot-breaking to most-plot-breaking order.
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It appears linked to the appearance of a comet in the sky which drives dragons into a dangerous rage that causes them to destroy anything they come across and lasts for months. There are stories that a former Chosen of Mystra, Sammaster, attempted to use a spell to duplicate a dragon rage years ago in Vaasa but was destroyed and killed. There is no known counter spell to what Sammaster sought to create with his magic.