As punishment for his part in the Dark Exile that sent the Prime Evils to the mortal realm, Duriel has been left behind by Baal to guard the Tomb of Tal Rasha.
Embittered by this new position of solitary servitude, the Lord of Pain has claimed the souls and blood of many bold adventurers.5
Prior to patches implemented in the Lord of Destruction era, Duriel had access to the Charge skill. Prior to that change, Duriel was notorious for his ability to fell would-be heroes before his cramped arena had even finished loading.
"Duriel, brother to Andariel, is also known as the Maggot King, or the Lord of Pain. He has been seen only once in Sanctuary, in the form of a horrific, grotesque maggot-like aberration." -Deckard Cain, Book of Cain, Page 31.
First true test if your character is strong enough to carry on higher levels in normal mode.
As @Aelanwyr explained difficulty is added also because area of the chamber is tiny, like a small boxing ring and its almost impossible to run away if you dont have faster run/walk. Holy Freeze aura hidden under its body complicates situation even more as a permanent slowing effect. Its good idea to even get crushing blow on merc or your weapon to try and bring it down as soon as possible.
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