It appears that even after agreeing to leave Sanctuary be, the powers of Heaven and Hell continued to war over the fortress for a time. The blood of thousands of champions of the Light were spent in these battles, many of such champions being mortal. However, as it no longer contained the Worldstone, the interest of Heaven and Hell in the fortress had severely waned. By the time of the Prime Evils' intended return to Hell, the Pandemonium Fortress was occupied by the forces of Heaven, and was their last bastion before the Gates of Hell. However, by this point, it had effectively been abandoned. Diablo, having passed through the Infernal Gate, passed through the fortress before entering Hell. Still, it was from the fortress that a group of heroes, at the behest of Deckard Cain and Tyrael hi