Mephisto was the first Prime Evil to be captured, and his Soulstone was put into the hands of the local priesthood, the Zakarum, for safekeeping. They kept it under a Zakarum temple in what would eventually become Kurast. In the meantime, the Horadrim pursued and eventually captured all three of the Prime Evils.
Eventually, however, Mephisto managed to overcome the powers of the Soulstone that imprisoned him enough to influence and corrupt the Zakarum. The demon then had the priests work spells to shatter the Soulstone into seven shards, breaking the mystic seal and freeing the Lord of Hatred.5
"The legions of Mephisto are driven by a hatred of all living things - especially those who are pure of heart. He counts as minions both the walking dead, who forever seek vengeance upon the living, as well as a host of demonically corrupted creatures whose twisted limbs and misshapen bodies leave them in eternal agony and rage."
Hell Terrorized Mephisto Drops were initially broken & bugged with the release of Patch 2.5 October 7th. In the video below, I highlight what looked to be a silent server-side fix.
Unfortunately, with the release of Patch 2.6, they broke the tables again, and they didn't fully rectify this permanently until the release of Patch 2.7. Hell Mephisto Terrorized Treasure Class now properly upgrades.
Using an Act1 mercenary instead of Act2 is recommended if farming with the "moat trick".
The rogue mercenary will likely stand next to the player in distance and does not trigger Mephisto's attacks.
You can equip an Act 1 Mercenary with a Insight Bow, too.
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