|Leader||High Grandmaster Kothas of Mechitar|
|Headquarters||House of the Key, Hold of Belkzen|
Break the Great Seal and free Tar-Baphon
Source: Last Watch, pg(s). 73–77
The Seal-Breakers are a nihilistic sect that seeks to unmake reality itself and has existed, under various forms and names, since the Age of Legend. Its current incarnation dates to the Shining Crusade, and its current goal is to break the three seals empowering the Great Seal in Gallowspire to set the Whispering Tyrant Tar-Baphon free.
Tales from the Age of Legend speak of some Azlanti who would reveal the presence of the alghollthus manipulating them in order to unleash the revelation's fury upon an unsuspecting world. The Umbral Leaves spoke vaguely of those who sought to bring back Zon-Kuthon from Xovaikain before he was freed just after Earthfall. Such nihilists can be traced throughout the history of Golarion to at least as early as the reign of Pharaoh Kamaria, who openly worshipped Rovagug, if not to the time of Gormuz itself.
When Archmage Geb founded the nation bearing his name, he also brought the Key of Geb, which contained lore revered by those who sought to break the walls of reality, and allegedly powers that could be leveraged to do so. For 1,500 years, it laid within Geb's catacombs beneath the Cinerarium in Mechitar. After Geb committed suicide but before he returned as a ghost, his advisor Kothas stole the Key of Geb, seeking its secrets to unmake reality, and fled what he believed to be the fall of Geb. Kothas pledged his service to Tar-Baphon, and fled again after his new master was slain by Aroden. When Tar-Baphon rose from the dead as the Whispering Tyrant, Kothas saw in him the means of destroying of the world as prophesied in the ancient scroll, and returned to his service.
When Tar-Baphon was defeated and imprisoned within Gallowspire at the end of the Shining Crusade, Kothas was away from his master, but lost access to the Key of Geb, which had been stored in the Tyrant's vault. He quickly realised the nature of the seals that protected Gallowspire, and founded the Seal-Breakers as a formal organisation to recover the Key of Geb and follow the Key of Geb's teachings.
The Seal-Breakers' structure is based loosely on various holy orders and divided into cells of fewer than a dozen members, who are usually aware of the existence of at most three other cells and know very little about their activities. However, all cells are aware of and answer to the Seal-Breakers' Grandmasters: Kothas, Cravus Tullius, and Soliennu Varsari. The Grandmasters and their orders can all be recognised by secret ciphers disseminated to the order.
Paizo published a major article about the Seal-Breakers in Last Watch.