Tyrael, Adria, Leah, and the Heroes journey to Bastion's Keep, the only line of defense between Azmodan's forces and the rest of Sanctuary. As Leah studied in Caldeum's library to find more answers about the Black Soulstone and Azmodan, she received a vision from Azmodan, who told her that he is sending an army from the ruins of Mount Arreat to take the Black Soulstone for himself. The Heroes kill Belial and trap his soul within the Black Soulstone, freeing Caldeum. Kulle reveals its hiding place and completes the unfinished Soulstone, but is killed by the Heroes after he attempts to steal it. In order to obtain the Black Soulstone, the Heroes resurrect the mad Horadric mage, Zoltun Kulle. Adria tells Tyrael and the Heroes that the key to stopping the demons is the Black Soulstone, which can trap the souls of the seven Lords of Hell and destroy them forever. The Heroes kill Maghda, and rescue Leah's mother, Adria. To avenge Cain's death, the Heroes track Maghda to the city of Caldeum, which is controlled by her master, Belial. Tyrael reveals that he was disgusted with his fellow angels' unwillingness to protect humanity from the forces of Hell, so he cast aside his divinity to become a mortal, and came to warn Sanctuary about the arrival of the demon lords Belial and Azmodan. The Heroes rescue the stranger and return his sword, causing him to regain his memories: he is fallen angel Tyrael. Cain, dying from Maghda's torture, uses the last of his strength to repair the sword and instructs the Heroes to return it to the stranger. However, the Heroes force Maghda to flee, and she kidnaps the stranger instead. The Heroes retrieve the pieces, but the witch Maghda captures Cain and the pieces, attempting to force him to repair the sword for herself. This stranger has no memories except that he lost his sword, which was shattered into three pieces. The Heroes rescue Cain and finds that the fallen star is a person. One of the townspeople, Leah, asks the Heroes to help find her uncle, Deckard Cain, who went missing in the Tristram Cathedral when the falling star struck it. The Heroes arrive in New Tristram to investigate a fallen star. It is up to a new generation of heroes to face the forces of evil threatening the world. Having survived that onslaught, Tyrael rewarded the heroes by sending them to safety. Sanctuary was saved twenty years prior by unnamed heroes in Diablo II.

Diablo 3 gameplay health