Harbinger

Legend tells of a natural disaster that occurs once every thousand years. This disaster is preceded by something referred to only as the Harbinger. There are next to no eye-witness accounts of these things, with very little information escaping each disaster.

It is said that in the weeks before the Harbinger awakens, there are some warning signs Once the first warning sign presents itself, there is supposedly only weeks before the Harbingers awaken.
 * Dragons flee their nests
 * Magic weakening or taking new forms
 * Increased aggression in wildlife
 * Certain races and individuals also become more aggressive in response to an unknown factor

Described in the few accounts of this event is word of entire continents town to shreds, creatures driven to extinction and civilizations reduced to ash.