Well, NOTHING like that. I ended up with +30 robes and sold them for as much as $400.
But here's how I killed the Giant Mattacker at leve 16/20. They spawned on the flats in a cold area of the world. One of the spawns was near a thick forest, this Mattaker was huge, I learned the spawn spots and would move between them, when one would spawn I would shoot it with a spell or an arrow and run like hell to the forest. Monsters would stay agged on who ever attacked it first and only the first attacker could loot the corpse, so that your kill couldn't be stolen. The Mattaker couldn't get into the forest it was so big it couldn't get in between the trees. So as soon as I got in the forest, not a sure thing/I died allot, I could spin around an hit them with everything I could carry, usually, until they died; they had an incredible amount of hit points. But it was a ton of fun, to me, and I was getting a ton of xp for each kill so that's about all I did that month; I leveled 9 or 10 times, maybe more. Nobody knew at the time that these robes were a one shot deal, heck I gave several away to buddies coming to AC from EQ that I'd played with since UO and some friends I'd met in AC.