Tar-Baphon is Sealed

Military action

The Shining Crusade manages to weaken and subsequently imprison the lich.

In 3827 AR, the crusaders at last reached Gallowspire in ruined Adorak. The Taldan general, Arnisant, fought the Tyrant and, using the artifact known as the Shield of Aroden, was able to withstand the lich's magic. When the shield eventually shattered, it burned the lich with holy fire, weakening the Tyrant, forcing him to flee to Gallowspire. The crusaders, unable to find Tar-Baphon's phylactery (which was allegedly hidden by Urgathoa so no one, not even the gods, could locate or find a way to destroy it) or to spare more resources to invade Gallowspire, imprisoned him, using a powerful magic ward known as the Great Seal. Each branch of the alliance responsible for defeating him was tasked with guarding one of the three lesser seals across Golarion that would keep the Great Seal intact. The province of Lastwall (now an independent country of the same name) was then established forever to watch over the Tyrant's prison.