Arena Killer was a competitor in the first series of Dutch Robot Wars. It fought through to the second round, where it fell to eventual runners-up Lizzard.
In addition, Arena Killer fought in German Robot Wars under the name Absolut Krankhaft, German for "Absolutely Nauseating", because there were not enough native German competitors. Because the letters were welded on the robot, the team needed a name for the German Series that used the same letters. It was chosen by Werner Hess who was the team's speaker in German interviews. Absolut Krankhaft fell in the first round against eventual winner and runner-up Black Hole and Tsunami.
Arena Killer was dismantled in the late 2000s, with team captain Jeroen van der Loo focusing on his new machine, Tough as Nails.
Arena Killer was a small two-wheel drive, wedge-shaped robot armed with an electric powered lifter, which it used to topple other robots over. It was painted blue and white, with its initials 'AK' painted red and the lifter finished in black with silver teeth at the bottom. Unusually, Arena Killer's wedge did not entirely extend to the rest of its body, with the robot's wheel arches being clearly seen protruding from the narrow box section behind the wedge.
In its first battle, Arena Killer faced The Lethal Swan. The robots danced around each other in the opening stages, with Arena Killer sustaining a small blow from the Swan's head. Arena Killer then attacked The Lethal Swan from the side, flipping it over and immobilising it. Arena Killer kept out of the way of the House Robots, having won the first battle of the series.
In the second round, Arena Killer met Lizzard. Several times, it tried to lift Lizzard, but had no success. It was swiped by Lizzard's tail before being pushed into a CPZ, where Shunt axed it and flipped it with its scoop. Arena Killer could not self-right, so Shunt axed its underside before righting it. Lizzard was immobilized by the house robots at the end, but the match still went to a jury's decision because Lizzard was still mobile and should not have been attacked. The decision was in favour of Lizzard, and Arena Killer was eliminated.
"It was a very quick fight, where I first found out the power of a spinning weapon from the opponent."
— Jeroen van der Loo
Arena Killer also entered German Robot Wars under the name Absolut Krankhaft. Almost immediately in its melee, a team effort by Black Hole and Tsunami threw Absolut Krankhaft onto its back, Black Hole cutting through the 2mm steel plate armour and bending the 5mm flange from the IPE80 frame in the process. Tsunami then righted Absolut Krankhaft; however almost immediately flipped it over again. Absolut Krankhaft was counted out by Refbot and paraded around the arena by Sir Killalot, flipped by the floor flipper and eventually pitted, eliminating it from the competition
Arena Killer is the only robot to enter two different national versions of Robot Wars (Dutch Series 1 and the German Series) that never entered the UK Series. However, its successor Tough as Nails entered the seventh and eighth UK series.
During its introduction in Dutch Series 1, Arena Killer's strength was listed as its self-righting mechanism. However, during its introduction in the German series as Absolut Krankhaft, its weakness was listed as its lack of a self-righting mechanism. Arena Killer did not have a self-righting mechanism.