Feedback:User/Death Sligher/Final Blow Arena

Some people in here my know what I mean. If I say there was a cow lvl in diablo2(a game from blizzard) and that it was uber fun do kill all those 100ths of cows. So I was thinking: what if anet makes a arena(or takes a abandoned one) and puts all sort of monsters in it from every campaign from guildwars. with the same skillbars. Then the people who go in it will get a protection skill which prevents them from getting every sort of damage(spells,attacks,touches etc). And boost the attributes of people in it to 40(example can be higher or lower). Then people can take 7other skills from gw1 and try to kill as many as possible enemy's for fun. In lets say 5minutes. After these 5minutes there spawns a chest which gives the players a reward. Which is based on the number of enemy's killed in those 5minutes. The monsters dont drop any loot in these 5minutes since they would drop to much because it are 1000's of monsters or more^^.