This mystical object protected Sanctuary from Heaven and Diablo IV Gold Hell and now acts as a protector for the region in its place. Tyrael does not appear likely to lead any further actions into Hell or even go further beyond The Pandemonium Fortress, where he might offer advice similar to Deckard Cain to those who choose to listen.
Five classes playable in Diablo have been revealed so far and all are takes on options from earlier games. With each of the games that has been released so far has been different Perhaps Tyrael can be a hand in the battle and help balance the sides by giving players the chance to take on angelic or demon-like powers , in exchange for responsibilities to Sanctuary. This sort of mechanism could be a natural progression from the multi-tree development that was announced for the series.
It is unlikely that Blizzard intends to turn Angels and Demons into classes as the franchise focuses on the people caught between their way. But as a mortal caught between Heaven and Hell, Tyrael sits in a position unlike any other in all of Diablo history. He will more likely be an equalizer in the story, or even an impartial voice, instead of taking sides like previously. Although he may be forced to take sides, Tyrael is now aware of the value of mortals, and that is why he'll most likely be a part of the events of buy Diablo 4 Gold.