The Coldharbour Compact was an agreement between the Tribunal god Sotha Sil and eight powerful Daedric Princes: Azura, Boethia, Hermaeus Mora, Hircine, Malacath, Mehrunes Dagon, Molag Bal, and Sheogorath. The Compact was created in response to the destruction of Gilverdale by Molag Bal. It was made between the 3rd and 5th of Rain's Hand, 1E 2920 when Sotha Sil entered Coldharbour from Artaeum's Dreaming Cave.
Little is known about the Compact but it is theorized that it prevents the Princes from directly manifesting on Nirn. It is also speculated that, in order to secure the agreement of the Princes, Sotha Sil either made a credible threat to them or presented a significant offer in exchange. According to Hermaeus Mora's Seekers, the prince made a pact with every mortal on Nirn to cease all direct interposition in Mundial affairs, and for his agreement it seemed he was paid a great price, something he dearly desired. The compact appeared to bind in both directions, resulting in mortals no longer coming to Apocrypha.
Despite agreeing to the terms of the Compact, Mehrunes Dagon arrived in Tamriel and destroyed the city of Mournhold just a few months later in Sun's Dusk of 1E 2920, before being banished by Almalexia and Sotha Sil. For breaking the truce, Dagon himself was broken on the soil of Mournhold.[UOL 1]
The Compact did not bind Daedric Princes that were not present during the Compact, as the Daedric Triad composed of Clavicus Vile, Mephala, and Nocturnal attempted to remake Nirn in their image during the Daedric War of the Second Era. Mephala and Clavicus Vile joined the Compact circa 2E 582 after Nocturnal took control of the triad's plot, and aided the Psijic Order in stopping her from achieving infinite power.
The Compact did not prevent Molag Bal's attempted Planemeld in the Second Era nor did it stop Mehrunes Dagon from manifesting directly on Nirn in his true form during the Oblivion Crisis in 3E 433. It is possible that Sotha Sil's demise left nobody to enforce the Compact. It's also possible that the Compact was circumvented in these cases due to them being brought about by mortals (namely Mannimarco and Mankar Camoran).
- 2920, The Last Year of the First Era by Carlovac Townway — A fictional series of books about historical events involving Vivec and the Empire
- The Coldharbour Compact — A poem on Sotha Sil's mysterious First Era agreement with the Daedric Princes
- 2920, Rain's Hand — Carlovac Townway
- The Coldharbour Compact
- Sotha Sil's dialogue in ESO: Clockwork City
- Secrets Overheard in Apocrypha — Morian Zenas
- 2920, Sun's Dusk — Carlovac Townway
- The Truth in Sequence: Volume 8 — Deldrise Morvayn
- Summerset Quest Line of ESO
- Events of ESO
- Events of Oblivion
Note: the following references are not from official sources. They are included to provide a rounder background to this article, but may not reflect established lore.