Kerafyrm was only killed because a recent patch had rendered NPC Regen bugged. Rallos Zek players specifically noticed and took advantage of this to kill him. It wouldn't have been possible otherwise, as his regen was way more than their DPS normally.
One of the hardest mobs in the game I would have to say was Tunat`Muram. He wasn't even killed until after the next expansion came out with a 5 level increase and more AA's, gear, etc.
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