The original Horadrim captured two of the three within powerful artifacts known as Soulstones and buried them deep beneath the desolate eastern sands. The third Evil escaped capture and fled to the west with many of the Horadrim in pursuit. The third Evil—known as Diablo, the Lord of Terror—was eventually captured, his essence set in a Soulstone and buried within this labyrinth.
From the Diablo IV game files (via the d4data project). Diablo IV © Blizzard Entertainment. Fan site, not affiliated with Blizzard.
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