Borderlands: The Secret Armory of General Knoxx DLC

Borderlands provided me with a fair share of difficult bosses. Consider Marley and Moe, for example, two overpowered skag bosses that are horrendous when you are low-leveled and playing solo. (The key, I've found, is to keep the little skags alive. Sure, they'll winnow away at your HP, but they're quick kills, which ensures a Second Wind every time.) Consider Skagzilla, another overpowered skag boss who has, more than once, survived longer than all the ammunition in my arsenal. (This is where action skills come in handy, and let's not forget buffs that heal and regenerate ammunition.) Consider not the end boss, but the army of Guardians lining the mountainside leading up to the vault. (Shock weapons destroy their shields while shotguns and automatic weapons assure that your bullets make contact with speedy alien flesh.) But how does any of this compare with the optional boss in The Secret Armory of General Knoxx DLC named Krawmerax or to the latter arena matches in the Circle of Duty quest-line? Of course, for those brave enough to complete either the Krawmerax or Circle of Duty challenges, there are ample rewards. Tons of great equipment. A guaranteed level for whatever weapon you are holding the moment Krawmerax dies. And let's not forget: Bragging rights. Not everyone is bold enough to follow up on these side quests.