The Thrassian Plague (called slug famine by some ancient texts) was an artificially-created pandemic of mass proportions that occurred in 1E 2260, and the first known historical event to happen after the Dragon Break. It is estimated that half of the population of the Iliac Bay, and perhaps even Tamriel, perished because of it. It was created by the Sload and received its name from their homeland, the coral kingdom of Thras.
While the reasons for its creation and the methods used to discover the culprits are uncertain, it has been established that the slugfolk of Thras released this calamity on Tamriel. Appearing in 1E 2260 (some sources state it was as early as 1E 2200), it washed upon the shores of western Tamriel, closest to Thras, and soon spread further across the mainland (going as far as Elsweyr), destroying cultures and decimating populations as it went. The Archmage Syrabane, using his powerful ring, is said to have saved many people from perishing from the disease, possibly even finding a cure.
The Thrassian Plague had major political and cultural repercussions on Tamriel, the most notable one being the assembling of the All Flags Navy, tasked with the invasion of Thras. Forces were sent from almost every nation of western Tamriel, ancient enemies putting asides their differences to exact revenge on the Sload. Assisted by Syrabane and led by Bendu Olo, its Baron-Admiral and the king of Anvil, the All Flags Navy "sailed to Thras, slaughtered all the Sload they could find, and, with great unknown magicks, sunk their coral kingdoms into the sea." It would take many years before Thras was restored to its former glory, and its population never attempted any similar attack on Tamriel.
Other consequences of this temporary alliance were evident decades later. The western parts of Cyrodiil began to overshadow the more advanced and religiously ardent east, which eventually led to the War of Righteousness that ended the thousand-year rule of the Alessian Order, which in turn shifted the focus of power in the Iliac Bay from Daggerfall to Wayrest.
Another dire consequence of the Thrassian Plague was the destruction of the equilibrium of the Khajiiti people due to heavy loss of life. The disease forced the survivors into roles they did not choose, polarizing their culture and forever changing their region from sixteen peaceful and co-existing states that resisted all foreign invasions into two very culturally opposed and politically divided states, Pellitine and Anequina.
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- A History of Daggerfall — Odiva Gallwood
- The War of Betony — Vulper Newgate
- Pocket Guide to the Empire, 1st Edition: Cyrodiil — Imperial Geographical Society, 2E 864
- Pocket Guide to the Empire, 1st Edition: The Wild Regions — Imperial Geographical Society, 2E 864
- Pocket Guide to the Empire, 3rd Edition: Other Lands — Imperial Geographical Society, 3E 432
- Pocket Guide to the Empire, 3rd Edition: Sugar and Blood: the Cats of the South — Imperial Geographical Society, 3E 432
- Pocket Guide to the Empire, 3rd Edition: All the Eras of Man, A Comprehensive History of our History — Imperial Geographical Society, 3E 432
- Varieties of Faith in the Empire — Brother Mikhael Karkuxor
- Tamrielic Artifacts — Yagrum Bagarn
- Wayrest, Jewel of the Bay — Sathyr Longleat
- Pocket Guide to the Empire, 3rd Edition: The Ra Gada: Hammerfell — Imperial Geographical Society, 3E 432
- Pocket Guide to the Empire, 1st Edition: High Rock — Imperial Geographical Society, 2E 864