Tyrael becomes the Fallen Star in Diablo 3 from MeadeDorian's blog

By tearing off his own wings and plummeting to Sanctuary, where the Nephalem's heirs live, Tyrael becomes the Fallen Star in Diablo 3. Tyrael takes control of the Black Soulstone and banishes the Prime Evils with the help of a powerful descendant D2R ladder items. Tyrael was the one who sent his companion to Pandemonium in order to eradicate death itself when Maltheal, the Archangel of Death, pursued the stone and turned against all of his allies.

Tyrael decides to keep his mortal form, but he and his angelic brothers reunite to become both the Aspect of Wisdom and Justice. At the end of Diablo 3, he wonders if his new mortal companion, who may be corrupted, will one day pose a threat to Sanctuary, Heaven, and Hell—or even life itself. It's likely that the Aspects of Wisdom and Justice won't just stand by as Inarius leads an army through Hell in search of Lilith, his former love.

In the most recent Diablo 4 movie trailer, which was released by Blizzard, Inarius is shown facing Lilith with armies at their backs. Although Tyrael is not directly involved in this scene, his creation of the Horadrim and influence over the various Paladins of Sanctuary indicate that he is. On the battlefield, light and darkness clash, and Tyrael, who is now dead, is somewhere in between.

It is possible his presence will be felt through these mediators except if occasions pressure him into taking a potentially rash action. Tyrael actually feels the repercussions of obliterating the Worldstone toward the finish of Diablo 2. He now serves as the land's protector in place of that mysterious artifact, which shielded Sanctuary from both Heaven and Hell. Tyrael doesn't appear to be going any further than the Pandemonium Fortress buy diablo II resurrected items, where he might offer advice similar to Deckard Cain to those who stay and listen.