Tyrael appears at the very end of the act, after a player has defeated Duriel, and gives the following message:
::''I thank you, mortal, for my freedom. But I did expect you earlier. '':''I am the Archangel Tyrael. I came here to prevent Diablo from freeing his brother, Baal. But I have failed. Now, Terror and Destruction roam free throughout your world. '':''Even now, they head towards the Eastern capital of Kurast - to the very heart of the Zakarum Temple. There they hope to find their eldest brother, Mephisto, the Lord of Hatred who was imprisoned there ages ago. '':''If the three Prime Evils unite, they will be invincible. ::''Though it is unclear as to what their aims are, it is certain that they must be stopped at all costs. '':''I am broken and the energies that tie me to this world are diminishing rapidly. '':''You must take up this quest and prevent the Three Brothers from reuniting. You must cross the sea and search for Diablo and Baal in Kurast.'' ::''Now hurry, mortal... Time is running out for all of us! ''
=Act Four Dialogues=