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Carnax
From Aqpedia
Carnax was originally a series of battles with parts of Carnax at 1500 to 2000 HP (except for all of Carnax, which has 4500 HP) that was only reachable through the teleporter in the Guardian Tower. (Note: it's still available). Also, they would have to be battled the whole way through, there was no 1 on 1 option, the full encounter could only happen randomly, and the graphics were really bad.
Overview Of New
Carnax is the most powerful monster ever created in AdventureQuest RPG. His limbs and head, while extremely powerful, retreat as soon as 25% of their HP is depleted. However, do not EVER choose to battle him at full power: he now waits until his HP reaches 0, his attacks are far more powerful, and, well, he has 3 billion HP! Basically, the only way to beat him is to prepare, since Powerword Die doesn't work on him. That, or hack the game, which results in the immediate termination of your account as soon as you are discovered. All in all, just don't do one on one, unless you're above level 90 and are extremely well prepared! Also, don't try to battle his limbs unless you are about level 50 or so at least.
How To Still Reach Him
The Carnax War took up most of 2005, although some of the story leading up to it was released in 2003 and 2004. After that, he was unreachable until the release of the Rip in the Sky. Here's how to find him. First, go to the Rip in the Sky. Then, find Falerin's chamber (just look around). Once you find it, click on the scroll next to the one with the smoke (if you click on the smoking one, you'll be teleported to the Dragon War, the first big war AQ ever had). If you're a Guardian, you will then be teleported to the Carnax War. If you aren't, however, you have to upgrade to proceed.