Forum:Challenge Help

So I have wanted to start working on challenges and most of them involve 2,500 of something which is a good bit. I was wondering if anyone knew of some infinite spawning areas. Such as the Rakk Hive wich Rakk spawn out of infinitely. So if anyone knows areas like this (preferably skags) and besides the underdome that would be great. ICB MstrFalco 20:45, July 18, 2010 (UTC)