From publisher blurb:
Ironroar's Last Stand is a Fifth Edition adventure intended for three to five characters of 5th to 6th level and optimized for four characters with an average party level (APL) of 6. The wards of an ancient prison holding a minotaur shaman and his undead army are beginning to weaken. A powerful ley line runs under the prison, and its surges are growing stronger. It’s only a matter of time before they destroy the wards and free the shaman!
This adventure takes place in the Freelands campaign setting but fits into any existing campaign with only a few modifications and name changes.
Background
Long ago, in a land of rugged mountains and sprawling caves, lived the Boulderfury minotaur tribe. The minotaurs were proud and fierce warriors who lived in harmony with the earth and had great magic and combat skills. However, their lands were not immune to the ravages of war, and one day, a powerful shaman named Goeban Ironroar rose to challenge their rule.
Goeban had a dark ambition: to conquer the minotaurs and enslave its people. He raised an army of undead soldiers, twisting and corrupting their souls with his dark magic, and marched against the Boulderfury. The war was long and brutal, but in the end, the tribe emerged victorious with the help of the Everguard, a legendary order of paladins from a neighboring kingdom. They harried Goeban into hiding within his fortress and used their earth magic to bury it deep beneath the ground, transforming it into an underground prison where they would be kept for eternity.
But Goeban was not so easily defeated. Using ley line magic and alchemy, he unnaturally extended his life and remains alive within his throne room prison. The Everguard knew they could not leave the prison unguarded, so they appointed a sect of minotaur guardians to watch over the prison and ensure that the shaman's evil would never be unleashed again.
For over five centuries, the prison lay undisturbed, a hidden and forgotten corner of a kingdom that eventually faded away. But now, the seal on the prison is weakening, and Goeban's dark magic is stirring again. His army of undead soldiers is beginning to awaken, and the descendants of the Boulderfury need help to end Goeban's evil once and for all.