According to Deckard Cain, after the Angels and humans defeated the seven Prime Evils and sealed them inside Soul Stones, the Human World truly enjoyed several hundred years of peace.
Just as Duanmu Huai had said before, without a way to completely destroy Warp Space creatures, sentencing them to life imprisonment and locking them up was probably the best option. At least, if nothing went wrong, they could keep these fellows imprisoned until the end of the world.
The prerequisite was that nobody broke them out.
But there was always the chance of something going wrong.
Several hundred years later, a royal family member named Leoric brought his followers here under orders from the Holy Church to rule over the region.
However, Leoric did not know at the time that this unclaimed land was no safe place. There was a ruin beneath it, and within that ruin was one of the three Daedric Princes, the King of Fear, Diablo, sealed away.
Was this a coincidence?
Of course it was not. In fact, it had been a conspiracy from beginning to end. At the time, a Majin who worshipped the Daedric Princes infiltrated the Holy Church and accompanied Leoric to this territory as part of his retinue. His goal was simple: make Leoric break the seal on the King of Fear and become its avatar in the mortal world.
After all, for Warp Space creatures to manifest in the real world, they needed a host to possess. And the clever, brave, and strong Leoric had been chosen to become the sacrifice the Majin offered to Diablo.
The plan went smoothly. When Leoric came here to rule, he was quickly chosen by the King of Fear. At first, the King of Fear intended to completely take over Leoric's body, but Leoric's firm